Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 13 - Cumulative Review - Page 969: 26

Answer

a) $9x^2-21x+12$ b) $90$ c) $-3x^2+9x-1$ d) $-31$

Work Step by Step

$f(x)=x^2-3x+2$ $g(x)=-3x+5$ a) $(f o g) (x)$ $f(g(x))$ $f(g(x))$ $f(-3x+5)$ $(-3x+5)^2-3(-3x+5)+2$ $(-3x+5)(-3x+5)-3*(-3x)+(-3)(5)+2$ $9x^2-15x-15x+25+9x-15+2$ $9x^2-30x+9x+25-15+2$ $9x^2-21x+12$ b) $(f o g) (x)$ $f(g(x))$ $f(g(-2))$ $g(x)=-3x+5$ $g(-2)=-3*-2+5$ $g(-2)=6+5$ $g(-2)=11$ $f(11)$ $11^2-3*11+2$ $121-33+2$ $88+2$ $90$ c) $g(f(x))$ $g(x^2-3x+2)$ $-3(x^2-3x+2)+5$ $-3*x^2+(-3)(-3x)+(-3)(2)+5$ $-3x^2+9x-6+5$ $-3x^2+9x-1$ d) $g(f(5))$ $f(x)=x^2-3x+2$ $f(5)=5^2-3*5+2$ $f(5)=25-15+2$ $f(5)=10+2$ $f(5)=12$ $g(12)$ $g(x)=-3x+5$ $g(12)=-3*12+5$ $g(12)=-36+5$ $g(12)=-31$
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