Answer
$-4$
Work Step by Step
$x=\log _{5}\left( \dfrac {1}{625}\right) \Rightarrow 5^{x}=\dfrac {1}{625}=5^{-4}\Rightarrow $
$x=-4$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 4 - Inverse, Exponential, and Logarithmic Functions - 4.3 Logarithmic Functions - 4.3 Exercises - Page 445: 19
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