Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 3 - Exponents, Polynomials and Functions - 3.3 Composing Functions - 3.3 Exercises - Page 258: 28



Work Step by Step

The student incorrectly omitted the expression $+8$ in his solution to get $g(f(x)).$ With $f(x)= 3x-10 $ and $g(x)= 7x+8 ,$ then by replacing $x$ with $f(x)$ in $g,$ \begin{array}{l}\require{cancel} g(f(x))=g(3x-10) \\\\ g(f(x))=7(3x-10)+8 \\\\ g(f(x))=21x-70+8 \\\\ g(f(x))=21x-62 .\end{array}
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