Intermediate Algebra (12th Edition)

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

Chapter 9 - Mixed Review Exercises - Page 639: 2

Answer

$36$

Work Step by Step

Let $ x=5^{\log_5 36} $. Taking the logarithm of both sides results to \begin{align*}\require{cancel} \log x&=\log5^{\log_5 36} .\end{align*} Using the properties of logarithms, the equation above is equivalent to \begin{align*}\require{cancel} \log x&=(\log_5 36)(\log5) &(\text{use }\log_b x^y=y\log_b x) \\\\ \log x&=\left(\dfrac{\log36}{\log5}\right)(\log5) &(\text{use Change-of-Base Formula} \\\\ \log x&=\left(\dfrac{\log36}{\cancel{\log5}}\right)(\cancel{\log5}) \\\\ \log x&=\log36 .\end{align*} Since $\log_b x=\log_b y$ implies $x=y$, then the equation above implies \begin{align*} x&=36 .\end{align*} With $x=5^{\log_5 36}$ and $x=36$, then $ 5^{\log_5 36} $ evaluates to $ 36 $.
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