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: 27



Work Step by Step

The student incorrectly multiplied $f(x)$ and $g(x)$ to get $f(g(x)).$ With $f(x)= 3x-10 $ and $g(x)= 7x+8 ,$ then by replacing $x$ with $g(x)$ in $f,$ \begin{array}{l}\require{cancel} f(g(x))=f(7x+8) \\\\ f(g(x))=3(7x+8)-10 \\\\ f(g(x))=21x+24-10 \\\\ f(g(x))=21x+14 .\end{array}
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