Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 9 - Chapter R-9 - Cumulative Review Exercises - Page 642: 41

Answer

$3\log x+\dfrac{1}{2}\log y-\log z$

Work Step by Step

Using the properties of logarithms, the given expession, $ \log\dfrac{x^3\sqrt{y}}{z} ,$ is equivalent to \begin{align*}\require{cancel} & \log\left(x^3\sqrt{y}\right)-\log z &(\text{use }\log_b \dfrac{x}{y}=\log_b x-\log_b y) \\\\&= \log x^3+\log\sqrt{y}-\log z &(\text{use }\log_b (xy)=\log_b x+\log_b y) \\&= \log x^3+\log y^{1/2}-\log z \\&= 3\log x+\dfrac{1}{2}\log y-\log z &(\text{use }\log_b x^y=y\log_b x) .\end{align*} Hence, the expression $ \log\dfrac{x^3\sqrt{y}}{z} $ is equivalent to $ 3\log x+\dfrac{1}{2}\log y-\log z $.
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