Thomas' Calculus 13th Edition

Published by Pearson
ISBN 10: 0-32187-896-5
ISBN 13: 978-0-32187-896-0

Chapter 1: Functions - Section 1.2 - Combining Functions; Shifting and Scaling Graphs - Exercises 1.2 - Page 18: 6

Answer

a. $-\frac{1}{3}$ b. $2$ c. $-\frac{x}{x+1}$ d. $\frac{1}{x}$ e. $0$ f. $\frac{3}{4}$ g. $ x-2$ h. $\frac{x+1}{x+2}$

Work Step by Step

Functions: $ f(x)=x-1$ and $ g(x)=\frac{1}{x+1}$ a. $ g(\frac{1}{2})=\frac{2}{3}$ so $ f(g(\frac{1}{2}))=\frac{2}{3}-1=-\frac{1}{3}$ b. $ f(\frac{1}{2})=-\frac{1}{2}$ so $ g(f(\frac{1}{2}))=\frac{1}{1-1/2}=2$ c. $ f(g(x))=\frac{1}{x+1}-1=-\frac{x}{x+1}$ d. $ g(f(x))=\frac{1}{x-1+1}=\frac{1}{x}$ e. $ f(2)=1$ and $ f(f(2))=1-1=0$ f. $ g(2)=\frac{1}{3}$ and $ g(g(2))=\frac{1}{1+1/3}=\frac{3}{4}$ g. $ f(f(x))=x-1-1=x-2$ h. $ g(g(x))=\frac{1}{1/(x+1)+1}=\frac{x+1}{x+2}$
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