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Arithmetic of Algebraic Fractions 21X3 36X Example Simplify A) 14X ,B)12X3

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Arithmetic of Algebraic Fractions 21X3 36X Example Simplify A) 14X ,B)12X3 Arithmetic of algebraic fractions 1.4 Introduction Just as one whole number divided by another is called a numerical fraction, so one algebraic expression divided by another is known as an algebraic fraction. Examples of the latter are x 3x +2y x2 +3x +1 , , and y x − y x − 4 In this section we explain how algebraic fractions can be simplified, added, subtracted, multiplied and divided. Prerequisites ① be familiar with the arithmetic of numerical fractions Before starting this Section you should ... ✓ add, subtract, multiply and divide alge- Learning Outcomes braic fractions After completing this Section you should be able to ... 1. Cancelling common factors 10 Consider the fraction 35 .Tosimplify it we can factorise the numerator and the denominator and then cancel any common factors. Common factors are those factors which occur in both the numerator and the denominator. Thus 10 5 × 2 2 = = 35 7× 5 7 Note that the common factor 5 has been cancelled. It is important to remember that only 10 2 common factors can be cancelled. The fractions 35 and 7 have identical values - they are 2 10 equivalent fractions - but 7 is in a simpler form than 35 . We apply the same process when simplifying algebraic fractions. Example Simplify, if possible, yx x x a) ,b),c) 2x xy x + y Solution yx (a) In the expression , x is a factor common to both numerator and denominator. 2x This common factor can be cancelled to give y x y = 2 x 2 x 1x (b) Note that xy can be written xy . The common factor of x can be cancelled to give 1. x 1 = xy y x (c) In the expression x+y notice that an x appears in both numerator and denominator. However x is not a common factor. Recall that factors of an expression are multiplied together whereas in the denominator x is added to y. This expression cannot be simplified. abc 3ab Simplify, if possible, a) 3ac ,b)b+a When simplifying remember only common factors can be cancelled. Your solution abc 3ab a) 3ac =b)b+a = 3 )Ti antb simplified be cannot This b) a) b HELM (VERSION 1: March 18, 2004): Workbook Level 0 2 1.4: Arithmetic of algebraic fractions 21x3 36x Example Simplify a) 14x ,b)12x3 Solution Factorising and cancelling common factors gives: 21x3 7 × 3× x × x2 3x2 36x 12 × 3 × x 3 a) = = b) = = 14x 7 × 2× x 2 12x3 12 × x × x2 x2 3x+6 Example Simplify 6x+12 . Solution First we factorise the numerator and the denominator to see if there are any common factors. 3x +6 3(x +2) 3 1 = = = 6x +12 6(x +2) 6 2 The factors x +2and 3 have been cancelled. 12 Simplify 2x+8 . Your solution 12 2x+8 = +4 x +4) x 2( = factors. common any cancel and denominator, and numerator the actorise F 6 2 6 × 3 3(x+4) Example Show that the algebraic fraction x+1 and x2+5x+4 are equivalent. Solution The denominator, x2 +5x +4,can be factorised as (x + 1)(x +4)sothat 3(x +4) 3(x +4) = x2 +5x +4 (x + 1)(x +4) Note that (x +4)isafactor common to both the numerator and the denominator and can be 3 3 3(x+4) cancelled to leave x+1 .Thusx+1 and x2+5x+4 are equivalent fractions. 3 HELM (VERSION 1: March 18, 2004): Workbook Level 0 1.4: Arithmetic of algebraic fractions 1 x−1 Show that x−1 and x2−2x+1 are equivalent fractions. First factorise the denominator Your solution x2 − 2x +1: 1) x 1)( x ( − − Identify the factor which is common to both numerator and denominator and cancel this common factor. Your solution x−1 (x−1)(x−1) = 1 x − 1 Hence the two given fractions are equivalent. Example Simplify 6(4 − 8x)(x − 2) 1 − 2x Solution The factor 4 − 8x can be factorised to 4(1 − 2x). Thus 6(4 − 8x)(x − 2) (6)(4)(1 − 2x)(x − 2) = = 24(x − 2) 1 − 2x (1 − 2x) x2+2x−15 Simplify 2x2−5x−3 First factorise the numerator and the denominator. Your solution x2+2x−15 2x2−5x−3 = 3) x +1)( x (2 − 3) x +5)( x ( − HELM (VERSION 1: March 18, 2004): Workbook Level 0 4 1.4: Arithmetic of algebraic fractions Finally cancel any common factors to leave Your solution +1 x 2 +5 x Exercises 1. Simplify, if possible, 19 14 35 7 14 a) 38 ,b)28 ,c)40 ,d)11 ,e)56 14 36 13 52 2. Simplify, if possible, a) 21 ,b) 96 ,c) 52 ,d) 13 5z 25z 5 5z 3. Simplify a) z ,b) 5z ,c) 25z2 ,d) 25z2 4. Simplify 4x 15x 4s 21x4 a) 3x ,b)x2 ,c)s3 ,d)7x3 5. Simplify, if possible, x+1 x+1 2(x+1) 3x+3 5x−15 5x−15 a) 2(x+1) ,b) 2x+2 ,c) x+1 ,d) x+1 ,e) 5 ,f) x−3 . 6. Simplify, if possible, 5x+15 5x+15 5x+15 5x+15 a) 25x+5 ,b)25x ,c)25 ,d)25x+1 7. Simplify x2+10x+9 x2−9 2x2−x−1 3x2−4x+1 5z2−20z a) x2+8x−9 ,b) x2+4x−21 ,c) 2x2+5x+2 ,d) x2−x ,e) 2z−8 6 2x 3x2 8. Simplify a) 3x+9 ,b) 4x2+2x ,c) 15x3+10x2 x2−1 x2+5x+6 9. Simplify a) x2+5x+4 ,b) x2+x−6 . 5 HELM (VERSION 1: March 18, 2004): Workbook Level 0 1.4: Arithmetic of algebraic fractions .:Aihei fagbacfractions algebraic of Arithmetic 1.4: 6 EM(ESO :Mrh1,20) okokLvl0 Level Workbook 2004): 18, March 1: (VERSION HELM bc c b d b = = × ÷ ad d a c a Division: oint P Key iiini efre yivrigtescn rcinadte multiplying. then and fraction second the inverting by performed is Division a epromdbfr ratrtemultiplication. the after or before performed be can n atr omnt ohnmrtraddnmntrcnb acle.Ti cancellation This cancelled. be can denominator and numerator both to common factors Any bd d b = × ac c a Multiplication: oint P Key hnmlil hi eoiaostgte.Ta is That together. denominators their multiply then lil w rcin nmrclo leri)w utpyternmrtr oehrand together numerators their multiply we algebraic) or (numerical fractions two ultiply m To .Mlilcto n iiino leri fractions algebraic of division and Multiplication 2. Answers 1 1 7 7 1 1. a) 2 ,b) 2 ,c) 8 ,d) 11 ,e) 4 . 2 3 1 2. a) 3 ,b) 8 ,c) 4 ,d)4 1 1 3. a) 5 b) 5,c) 5z2 ,d) 5z . 4 15 4 4. a) 3 ,b) x ,c) s2 ,d)3x 1 1 − 5. a) 2 ,b) 2 ,c)2,d)3,e)x 3, f) 5 x+3 x+3 x+3 5(x+3) 6. a) 5x+1 ,b) 5x ,c) 5 ,d) 25x+1 x+1 x+3 x−1 3x−1 5z 7. a) x−1 ,b) x+7 ,c) x+2 ,d) x ,e) 2 2 1 3 8. a) x+3 ,b) 2x+1 ,c) 5(3x+2) . x−1 x+2 9. a) x+4 ,b) x−2 . 2a × 4 2a × c 2a ÷ 4 Example Simplify a) c c ,b)c 4 ,c)c c Solution (a) 2a 4 8a × = c c c2 (b) 2a c 2ac 2a a × = = = c 4 4c 4 2 (c) Division is performed by inverting the second fraction and then multiplying. 2a 4 2a c a ÷ = × = from the result in b) c c c 4 2 1 × 1 × 1 × y × Example Simplify a) 5x 3x,b)x x,c)y x,d)x x. Solution 1 1 3x 3x 3 a) Note that 3x = 3x . Then × 3x = × = = 1 5x 5x 1 5x 5 1 1 x x b) x can be written as x . Then × x = × = =1 1 x x 1 x 1 1 x x c) × x = × = y y 1 y y y x yx d) × x = × = = y x x 1 x 2x y Example Simplify 3x 2y Solution 2x ÷ 3x We can write the fraction as y 2y .Inverting the second fraction and multiplying we find 2x 2y 4xy 4 × = = y 3x 3xy 3 7 HELM (VERSION 1: March 18, 2004): Workbook Level 0 1.4: Arithmetic of algebraic fractions 4x +2 x +3 Example Simplify × x2 +4x +3 7x +5 Solution Factorising the numerator and denominator we find 4x +2 x +3 2(2x +1) x +3 2(2x + 1)(x +3) 2(2x +1) × = × = = x2 +4x +3 7x +5 (x + 1)(x +3) 7x +5 (x + 1)(x + 3)(7x +5) (x + 1)(7x +5) It is usually better to factorise first and cancel any common factors before multiplying. Don’t remove any brackets unnecessarily otherwise common factors will be difficult to spot. Example Simplify 15 ÷ 3 3x − 1 2x +1 Solution To divide we invert the second fraction and multiply: 15 3 15 2x +1 (5)(3)(2x +1) 5(2x +1) ÷ = × = = 3x − 1 2x +1 3x − 1 3 3(3x − 1) 3x − 1 Exercises 5 × 3 14 × 3 6 × 3 4 × 28 1. Simplify a) 9 2 ,b) 3 9 ,c) 11 4 ,d) 7 3 5 ÷ 3 14 ÷ 3 6 ÷ 3 4 ÷ 28 2. Simplify a) a) 9 2 ,b) 3 9 ,c) 11 4 ,d) 7 3 3. Simplify × x+y 1 × 2 × a) 2 3 ,b) 3 2(x + y), c) 3 (x + y) 4. Simplify × x+4 1 × 3 × x × x+1 1 × x2+x πd2 × Q a) 3 7 ,b) 7 3(x + 4), c) 7 (x +4),d) y y+1 ,e) y y+1 f) 4 πd2 , Q g) πd2/4 6/7 5.
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