Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 5 - Exponential and Logarithmic Functions - 5.4 Logarithmic Functions - 5.4 Assess Your Understanding - Page 296: 113

Answer

(a) $(-\frac{1}{2},\infty)$ (b) $2$, $(40,2)$ (c) $ 121 $, $(121,3)$ (d) $ 4 $

Work Step by Step

(a) $2x+1\gt0\longrightarrow x\gt-\frac{1}{2}$ or $(-\frac{1}{2},\infty)$ (b) $G(40)=log_3(2\cdot 40+1)-2=log_381-2=2$ or point $(40,2)$ (c) $log_3(2x+1)-2=3 \longrightarrow log_3(2x+1)=5 \longrightarrow 2x+1=3^5 \longrightarrow x=121 $ or point $(121,3)$ (d) $G(x)=0 \longrightarrow log_3(2x+1)-2=0 \longrightarrow 2x+1=3^2 \longrightarrow x=4 $
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