Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 4 - Exponential and Logarithmic Functions - Section 4.5 Properties of Logarithms - 4.5 Assess Your Understanding - Page 332: 85

Answer

(a) $ x$, domain $(-\infty,\infty)$, (b) $ x$, domain $(0,\infty)$, (c) $ 5$, (d) $ ln(x^2)$, domain $\{x|x\ne0 \}$, (e) $ 2$.

Work Step by Step

Given $f(x)=ln(x),g(x)=e^x,h(x)=x^2$, we have: (a) $(f\circ g)(x)=ln(e^x)=x$, domain $(-\infty,\infty)$, (b) $(g\circ f)(x)=e^{ln(x)}=x$, domain $(0,\infty)$, (c) $(f\circ g)(5)=5$, (d) $(f\circ h)(x)=ln(x^2)$, domain $\{x|x\ne0 \}$, (e) $(f\circ h)(e)=ln(e^2)=2$.
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