Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 12 - Exponential Functions and Logarithmic Functions - 12.3 Logarithmic Functions - 12.3 Exercise Set: 18

Answer

$-1$

Work Step by Step

Using $\log_bx^m=m\log_bx$ or the Power Rule of Logarithms, the given expression, $ \log_{5}\dfrac{1}{5} ,$ is \begin{array}{l}\require{cancel} \log_{5}5^{-1} \\\\= -1\log_{5}5 \\\\= -\log_{5}5 .\end{array} Since the $\log_bb=1,$ the expression, $ -\log_{5}5 ,$ simplifies to \begin{array}{l}\require{cancel} -(1) \\\\= -1 .\end{array}
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