Georgia Department of Education
Accelerated Mathematics II Frameworks Student Edition
Unit 2 Inverse and Polynomial Functions
3rd Edition April, 2011 Georgia Department of Education Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
Table of Contents
INTRODUCTION: ...... 3
Please Tell Me in Dollar and Cents Learning Task ...... 6
The Cantilever Learning Task..…………………………..…………………….14
Characteristics of Polynomial Functions Learning Task.…………...………..18
Program Evaluation Learning Task……………………………………………31
The Swimming Debate Learning Task..………………………...……………………..37
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
Accelerated Mathematics II – Unit 2 Inverse and Polynomial Functions Student Edition
INTRODUCTION: The exploration of inverse functions leads to investigation of: the operation of function composition, the concept of one-to-one function, and methods for finding inverses of previously studied functions.
ENDURING UNDERSTANDINGS: • Functions with restricted domains can be combined to form a new function whose domain is the union of the functions to be combined as long as the function values agree for any input values at which the domains intersect. • One-to-one functions have inverse functions. • The inverse of a function is a function that reverses, or “undoes” the action of the original function. • The graphs of a function and its inverse function are reflections across the line y = x.
KEY STANDARDS ADDRESSED:
MA2A2. Students will explore inverses of functions. a. Discuss the characteristics of functions and their inverses, including one-to-oneness, domain, and range. b. Determine inverses of linear, quadratic, and power functions and functions of the form a fx()= , including the use of restricted domains. x c. Explore the graphs of functions and their inverses. d. Use composition to verify that functions are inverses of each other.
MA2A3. Students will analyze graphs of polynomial functions of higher degree. n a. Graph simple polynomial functions as translations of the function f(x) = ax . b. Understand the effects of the following on the graph of a polynomial function: degree, lead coefficient, and multiplicity of real zeros. c. Determine whether a polynomial function has symmetry and whether it is even, odd, or neither.
MA2G5. Students will investigate planes and spheres. a. Plot the point (x, y, z) and understand it as a vertex of a rectangular prism. b. Apply the distance formula in 3-space.
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
RELATED STANDARDS ADDRESSED:
MA2P1. Students will solve problems (using appropriate technology). a. Build new mathematical knowledge through problem solving. b. Solve problems that arise in mathematics and in other contexts. c. Apply and adapt a variety of appropriate strategies to solve problems. d. Monitor and reflect on the process of mathematical problem solving.
MA2P2. Students will reason and evaluate mathematical arguments. a. Recognize reasoning and proof as fundamental aspects of mathematics. b. Make and investigate mathematical conjectures. c. Develop and evaluate mathematical arguments and proofs. d. Select and use various types of reasoning and methods of proof.
MA2P3. Students will communicate mathematically. a. Organize and consolidate their mathematical thinking through communication. b. Communicate their mathematical thinking coherently and clearly to peers, teachers, and others. c. Analyze and evaluate the mathematical thinking and strategies of others. d. Use the language of mathematics to express mathematical ideas precisely.
MA2P4. Students will make connections among mathematical ideas and to other disciplines. a. Recognize and use connections among mathematical ideas. b. Understand how mathematical ideas interconnect and build on one another to produce a coherent whole. c. Recognize and apply mathematics in contexts outside of mathematics.
MA2P5. Students will represent mathematics in multiple ways. a. Create and use representations to organize, record, and communicate mathematical ideas. b. Select, apply, and translate among mathematical representations to solve problems. c. Use representations to model and interpret physical, social, and mathematical phenomena.
Unit Overview:
The first and second tasks focus on exploration of inverse functions. In the first task of the unit, conversions of temperatures among Fahrenheit, Celsius, and Kelvin scales and currency conversions among yen, pesos, Euros, and US dollars provide a context for introducing the concept of composition of functions. Reversing conversions is used as the context for introducing the concept of inverse function. Students explore finding inverses from verbal statements, tables of values, algebraic formulas, and graphs. In the second task, students explore one-to-oneness as the property necessary for a function to have an inverse and see how restricting the domain of a non-invertible function can create a related function that is invertible. Georgia Department of Education Dr. John D. Barge, State School Superintendent April, 2011 • Page 4 of 45 All Rights Reserved
Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
The last task introduces exponential functions and explores them through several applications to situations of growth: the spread of a rumor, compound interest, and continuously compounded interest. Students explore the graphs of exponential functions and apply transformations involving reflections, stretches, and shifts.
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
Please Tell Me in Dollar and Cents Learning Task
1. Aisha made a chart of the experimental data for her science project and showed it to her science teacher. The teacher was complimentary of Aisha’s work but suggested that, for a science project, it would be better to list the temperature data in degrees Celsius rather than degrees Fahrenheit.
a. Aisha found the formula for converting from degrees Fahrenheit to degrees Celsius: 5 CF=−()32 . 9 Use this formula to convert freezing (32°F) and boiling (212°F) to degrees Celsius.
b. Later Aisha found a scientific journal article related to her project and planned to use information from the article on her poster for the school science fair. The article included temperature data in degrees Kelvin. Aisha talked to her science teacher again, and they concluded that she should convert her temperature data again – this time to degrees Kelvin. The formula for converting degrees Celsius to degrees Kelvin is
KC= + 273 . Use this formula and the results of part a to express freezing and boiling in degrees Kelvin.
c. Use the formulas from part a and part b to convert the following to °K: – 238°F, 5000°F .
In converting from degrees Fahrenheit to degrees Kelvin, you used two functions, the function for converting from degrees Fahrenheit to degrees Celsius and the function for converting from degrees Celsius to degrees Kelvin, and a procedure that is the key idea in an operation on functions called composition of functions.
Composition of functions is defined as follows: If f and g are functions, the composite function f o g (read this notation as “f composed with g) is the function with the formula
( f o gx)()= fgx( ()) , where x is in the domain of g and g(x) is in the domain of f.
2. We now explore how the temperature conversions from Item 1, part c, provide an example of a composite function. a. The definition of composition of functions indicates that we start with a value, x, and first use this value as input to the function g. In our temperature conversion, we started with a temperature in degrees Fahrenheit and used the formula to convert to degrees Celsius, so
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
5 the function g should convert from Fahrenheit to Celsius: gx()=−() x 32. What is the 9 meaning of x and what is the meaning of g(x) when we use this notation?
b. In converting temperature from degrees Fahrenheit to degrees Kelvin, the second step is converting a Celsius temperature to a Kelvin temperature. The function f should give us this conversion; thus, fx( )=+ x 273 . What is the meaning of x and what is the meaning of f (x) when we use this notation?
c. Calculate ()fgo (45)= fg ( (45) ). What is the meaning of this number?
d. Calculate ( f o gx)()= fgx( ()) , and simplify the result. What is the meaning of x and what is the meaning of ( f o gx)()?
e. Calculate ()fgo (45)= fg ( (45) ) using the formula from part d. Does your answer agree with your calculation from part c?
f. Calculate ( gfo )() x= gfx( ()) , and simplify the result. What is the meaning of x? What meaning, if any, relative to temperature conversion can be associated with the value of ( gfo )() x?
We now explore function composition further using the context of converting from one type of currency to another.
3. On the afternoon of May 3, 2009, each Japanese yen (JPY) was worth 0.138616 Mexican pesos (MXN), each Mexican peso was worth 0.0547265 Euro (EUR), and each Euro was worth 1.32615 US dollars (USD).1
a. Using the rates above, write a function P such that P(x) is the number of Mexican pesos equivalent to x Japanese yen.
b. Using the rates above, write a function E that converts from Mexican pesos to Euros.
1 Students may find it more interesting to look up current exchange values to use for this item and Item 9, which depends on it. There are many websites that provide rates of exchange for currency. Note that these rates change many times throughout the day, so it is impossible to do calculations with truly “current” exchange values. The values in Item 3 were found using http://www.xe.com/ucc/ . Georgia Department of Education Dr. John D. Barge, State School Superintendent April, 2011 • Page 7 of 45 All Rights Reserved
Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
c. Using the rates above, write a function D that converts from Euros to US dollars.
d. Using functions as needed from parts a – c above, what is the name of the composite function that converts Japanese yen to Euros? Find a formula for this function. (Original values have six significant digits; use six significant digits in the answer.)
e. Using functions as needed from parts a – c above, what is the name of the composite function that converts Mexican pesos to US dollars? Find a formula for this function. (Use six significant digits in the answer.)
f. Using functions as needed from parts a – c above, what is the name of the composite function that converts Japanese yen to US dollars? Find a formula for this function. (Use six significant digits in the answer.) g. Use the appropriate function(s) from parts a - f to find the value, in US dollars, of the following: 10,000 Japanese yen; 10,000 Mexican pesos; 10,000 Euros.
Returning to the story of Aisha and her science project; it turned out that Aisha’s project was selected to compete at the science fair for the school district. However, the judges made one suggestion – that Aisha express temperatures in degrees Celsius rather than degrees Kelvin. For her project data, Aisha just returned to the values she had calculated when she first converted from Fahrenheit to Celsius. However, she still needed to convert the temperatures in the scientific journal article from Kevin to Celsius. The next item explores the formula for converting from Kelvin back to Celsius.
4. Remember that the formula for converting from degrees Celsius to degrees Kelvin is
KC= + 273 . In Item 2, part b, we wrote this same formula by using the function f where f ()x represents the Kelvin temperature corresponding to a temperature of x degrees Celsius.
a. Find a formula for C in terms of K, that is, give a conversion formula for going from °K to °C.
b. Write a function h such that hx()is the Celsius temperature corresponding to a temperature of x degrees Kelvin.
c. Explain in words the process for converting from degrees Celsius to degrees Kelvin. Do the equation KC= + 273 and the function f from Item 2, part b both express this idea?
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
d. Explain verbally the process for converting form degrees Kelvin to degrees Celsius. Do your formula from part a above and your function h from part b both express this idea?
e. Calculate the composite function hfo , and simplify your answer. What is the meaning of x when we use x as input to this function?
f. Calculate the composite function f o h , and simplify your answer. What is the meaning of x when we use x as input to this function?
In working with the functions f and h in Item 4, when we start with an input number, apply one function, and then use the output from the first function as the input to the other function, the final output is the starting input number. Your calculations of hfo and f o h show that this happens for any choice for the number x. Because of this special relationship between f and h , the function h is called the inverse of the function f and we use the notation f −1 (read this as “f inverse”) as another name for the function h.
The precise definition for inverse functions is: If f and h are two functions such that
(hfo )() x== hfx( ()) x for each input x in the domain of f, and ( f o hx)()== fhx( ()) x for each input x in the domain of h,
then h is the inverse of the function f, and we write h = f −1. Also, f is the inverse of the function h, and we can write f = h −1 .
Note that the notation for inverse functions looks like the notation for reciprocals, but in the inverse function notation, the exponent of “–1 ” does not indicate a reciprocal.
5. Each of the following describes the action of a function f on any real number input. For each part, describe in words the action of the inverse function, f −1, on any real number input. Remember that the composite action of the two functions should get us back to the original input.
a. Action of the function f : subtract ten from each input Action of the function f −1:
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
b. Action of the function f : add two-thirds to each input Action of the function f −1:
c. Action of the function f : multiply each input by one-half Action of the function f −1:
d. Action of the function f : multiply each input by three-fifths and add eight Action of the function f −1:
6. For each part of Item 5 above, write an algebraic rule for the function and then verify that the rules give the correct inverse relationship by showing that ff−1( ()xx) = and f ( fx−1()) = x for any real number x.
Before proceeding any further, we need to point out that there are many functions that do not have an inverse function. We’ll learn how to test functions to see if they have an inverse in the next task. The remainder of this task focuses on functions that have inverses. A function that has an inverse function is called invertible.
7. The tables below give selected values for a function f and its inverse function f −1. a. Use the given values and the definition of inverse function to complete both tables.
x f (x) x f −1()x
11 3
3 9 5 10
7 76 10 3 15 3 11 1
b. For any point (a, b) on the graph of f, what is the corresponding point on the graph of f −1?
c. For any point (b, a) on the graph of f −1, what is the corresponding point on the graph of f ? Justify your answer.
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
As you have seen in working through Item 7, if f is an invertible function f and a is the input for function f that gives b as output, then b is the input to the function f −1 that gives a as output. Conversely, if f is an invertible function f and b is the input to the function f −1 that gives a as output, then a is the input for function f that gives b as output. Stated more formally with function notation we have the following property:
Inverse Function Property: For any invertible function f and any real numbers a and b in the domain and range of f, respectively, fa()= b if and only if f −1(ba) = .
8. Explain why the Inverse Function Property holds, and express the idea in terms of points on the graphs of f and f −1.
9. After Aisha had converted the temperatures in the scientific journal article from Kelvin to Celsius, she decided, just for her own information, to calculate the corresponding Fahrenheit temperature for each Celsius temperature. 5 a. Use the formula CF=−()32 to find a formula for converting temperatures in the other 9 direction, from a temperature in degrees Celsius to the corresponding temperature in degrees Fahrenheit.
5 b. Now let gx()=−() x 32, as in Item 2, so that gx() is the temperature in degrees 9 Celsius corresponding to a temperature of x degrees Fahrenheit. Then g −1 is the function that converts Celsius temperatures to Fahrenheit. Find a formula for gx−1().
c. Check that, for the functions g and g −1 from part b, gg−1( ()xx) = and gg()−1() x= x for any real number x.
Our next goal is to develop a general algebraic process for finding the formula for the inverse function when we are given the formula for the original function. This process focuses on the idea that we usually represent functions using x for inputs and y for outputs and applies the inverse function property.
10. We now find inverses for some of the currency conversion functions of Item 3. a. Return to the function P from Item 3, part a, that converts Japanese yen to Mexican pesos. Rewrite the formula replacing Px() with y and then solve for x in terms of y.
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
b. The function P−1 converts Mexican pesos back to Japanese yen. By the inverse function property, if yPx= (), then P −1( y) = x . Use the formula for x, from part a, to write a formula for P −1( y) in terms of y.
c. Write a formula for Px−1( ) .
d. Find a formula for E−1 ()x , where E is the function that converts Mexican pesos to Euros from Item 3, part b.
e. Find a formula for Dx−1 (), where D is the function that converts Euros to US dollars from Item 3, part c.
11. Aisha plans to include several digital photos on her poster for the school-district science fair. Her teacher gave her guidelines recommending an area of 2.25 square feet for photographs. Based on the size of her tri-fold poster, the area of photographs can be at most 2.5 ft high. Aisha thinks that the area should be at least 1.6 feet high to be in balance with the other items on the poster.
a. Aisha needs to decide on the dimensions for the area for photographs in order to complete her plans for poster layout. Define a function W such that W(x) gives the width, in feet, of the photographic area when the height is x feet.
b. Write a definition for the inverse function, W −1 .
In the remaining items you will explore the geometric interpretation of this relationship between points on the graph of a function and its inverse.
12. We start the exploration with the function W from Item 11. a. Use technology to graph the functions W and W −1 on the same coordinate axes. Use a square viewing window.
b. State the domain and range of the function W.
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
c. State the domain and range of the function W −1 .
d. In general, what are the relationships between the domains and ranges of an invertible function and its inverse? Explain your reasoning.
13. Explore the relationship between the graph of a function and the graph of its inverse function. For each part below, use a standard, square graphing window with −10≤≤x 10 and −≤≤10y 10 .
a. For functions in Item 6, part a, graph f, f −1, and the line y = x on the same axes.
b. For functions in Item 6, part c, graph f, f −1, and the line y = x on the same axes.
c. For functions in Item 6, part d, graph f, f −1, and the line y = x on the same axes.
d. If the graphs were drawn on paper and the paper were folded along the line y = x, what would happen?
e. Do you think that you would get the same result for the graph of any function f and its inverse when they are drawn on the same axes using the same scale on both axes? Explain your reasoning.
−3 Consider the function fx()= . x a. Find the inverse function algebraically.
b. Draw an accurate graph of the function f on graph paper and use the same scale on both axes.
c. What happens when you fold the paper along the line y = x? Why does this happen?
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
CANTILEVERS LEARNING TASK:
A cantilever is a beam with support on only one end. Cantilevers are often used in constructing bridges, as pictured below:
http://en.wikipedia.org/wiki/Cantilever_bridge
A more common example of a cantilever may be a diving board: one end is anchored for stability and one is not so that it can extend over the pool.
A flag pole that is mounted horizontally is also a cantiveler:
Can you think of other any other types of cantilevers?
When force is applied to the unsupported end of the cantilever, it will bend. This amount of bending depends on different variables, as you may be able to imagine with the diving board example.
What are some of these variables?
Hypothesize how some of these variables are related to the amount of bending of a cantiveler.
In order to model this situation and to determine the relationships between some of the variables, we can make a ruler into a cantilever by using a C-clamp to secure the end ruler to the end of a flat table. Then, we can apply force to the end of the ruleer in order to make it bend by making it support a cup full of pennies.
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
Part A: Determining the Relationship between Bending and Force
1. First, we want to determine how the amount of bending changes when different amounts of force are applied. How can you collect data with these variables? How will you measure these variables?
2. Once you have decided how to collect your data, you want to record the amount of bending that takes place for 8 different amounts of force. (Discuss with your groups how to vary your amounts of force to be able to see a change in the amount of bending. Here our “force” is the weight of the pennies.)
a. Make a table that lists the amount of force for the eight different amounts of force.
b. Draw a scatterplot of these values.
3. By the shape of the plotted points, does this function seem to be linear, quadratic, or neither? a. Using the Linear Regression, Quadratic Regression, Cubic Regression, and Quartic Regression functions on your calculator, how can we determine which model fits the data the best? What does it for a model to “fit the data the best?”
b. Which model seems to fit the data most closely? How do you know?
c. Sketch this function over your scatterplot.
4. Write the equation for the model that best fits your data from your calculator. What type of function is this? a. Give the domain and range for this function. b. Using this function, predict how much the cantilever will bend for c. Using this function, predict how much the cantilever will bend if you had 100,000 pennies. d. Does this value make sense? Imagine what the ruler would look like if it was bending this much.
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
e. Recall the domain and range you specified for this function in (g). Consider your answers in parts (i) and (j). Given the context of the problem. Does the context restrict your domain and/or range? (Hint: At what force do you think the cantilever will break? How much can the ruler bend before it breaks?)
5. Is this function increasing or decreasing? In the context, what does that mean?
Part B: Determining the Relationship between Bending and Cantilever Length
1. Now, measure and record the amount of bending that takes place for at least 8 different lengths of the cantilever. Again determine within your group which lengths you can use to be able to see a different in the amount of bending.
a. Make a table that lists the amount of force for the eight different amounts of force.
b. Draw a scatterplot of these values.
c. By the shape of the plotted points, does this function seem to be linear, quadratic, or neither?
2. Using the Linear Regression, Quadratic Regression, Cubic Regression, and Quartic Regression functions on your calculator, determine which model fits the data the best.Which model seems to fit the data most closely?
a. Sketch this function over your scatterplot. b. In what ways does this function fit your data? In what ways does it not?
3. Write the equation for the model that best fits your data from your calculator. What type of function is this? a. Give the domain and range for this function. b. Using this function, predict how much the cantilever will bend for c. Using this function, predict how much the cantilever will bend if the length of the cantilever was 50 inches. d. Does this value make sense? Why or why not?
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
e. Recall the domain and range you specified for this function in (f). Consider your answers in parts (b), (g) and (h). Given this problem, how does the context restrict your domain and/or range?
4. Is this function increasing or decreasing? In the context, what does that mean?
5. What type of function is this?
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
Characteristics of Polynomial Functions Learning Task:
1. In the Cantilever Learning Task we learned about a third degree polynomial function, also called a cubic function. What do you think polynomial means?
Let’s break down the word: poly- and –nomial. What does “poly” mean?
a. A monomial is a numeral, variable, or the product of a numeral and one or more variables. For example: -1, ½, 3x, 2xy. Give a few examples of other monomials:
b. What is a constant? Give a few examples:
c. A coefficient is the numerical factor of a monomial or the ______in front of the variable in a monomial. Give some examples of monomials and their coefficients.
d. The degree of a monomial is the sum of the exponents of its variables. has degree 4. Why?
What is the degree of the monomial 3? Why?
e. Do you know what a polynomial is now?
A polynomial function is defined as a function, f(x)= n n −1 n − 2 2 1 a 0 x + a1 x + a 2 x + ... + a n − 2 x + a n − 3 x + a n , where the coefficients are real numbers.
The degree of a polynomial (n) is equal to the greatest exponent of its variable.
The coefficient of the variable with the greatest exponent (a0 ) is called the leading coefficient. For example, f(x) =4 x 3 − 5 x 2 + x − 8 is a third degree polynomial with a leading coefficient of 4.
2. Previously, you have learned about linear functions, which are first degree polynomial 1 functions, y =a 0 x + a1 , where a0 is the slope of the line and a1 is the intercept
(Recall: y = mx + b; here m is replaced by a0 and b is replaced by a1 .)
Also, you have learned about quadratic functions, which are 2nd degree polynomial functions, 2 1 which can be expressed as y = a 0 x + a1 x + a 2 .
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition
In the Cantilever Learning Task you found that a cubic function modeled the data in one of the investigations. A cubic function is a third degree polynomial function. There are also fourth, fifth, sixth, etc. degree polynomial functions. a. To get an idea of what these functions look like, we can graph the first through fifth degree polynomials with leading coefficients of 1. For each polynomial function, make a table of 6 points and then plot them so that you can determine the shape of the graph. Choose points that are both positive and negative so that you can get a good idea of the shape of the graph. Also, include the x intercept as one of your points.
For example, for the first order polynomial function: . You may have the following table and graph:
x y -3 -3 -1 -1 0 0 2 2 5 5 10 10
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Georgia Department of Education Accelerated Mathematics II Unit 2 3rd Edition