Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 2 - Review - Exercises - Page 234: 83

Answer

a. $x^2 - 6x + 6$ b. $ x^2 -2 $ c. $-3x^3 + 13x^2 - 18x + 8$ d. $\frac{x^2 - 3x + 2}{4-3x}$ e. $ 9x^2 - 15x + 6$ f. $-3x^2 + 9x -2$

Work Step by Step

Given $f(x) = x^2 - 3x + 2$ and $g(x) = 4-3x$ a. f+g $x^2 - 3x + 2 + 4-3x = x^2 - 6x + 6$ b. f-g $x^2 - 3x + 2 - (4-3x)) = x^2 -2 $ c. fg $(x^2 - 3x + 2)(4-3x) = -3x^3 + 4x^2 + 9x^2 -6x - 12x + 8$ $=-3x^3 + 13x^2 - 18x + 8$ d. f/g $\frac{x^2 - 3x + 2}{4-3x}$ e. f o g $f(4-3x) = (4-3x)^2 - 3(4-3x) + 2$ $= 9x^2 - 15x + 6$ f. g o f $g(x^2 - 3x + 2) = 4-3(x^2 - 3x + 2)$ $=-3x^2 + 9x -2$
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