Answer
$-3$
Work Step by Step
$\left( \dfrac {1}{4}\right) ^{x}=4^{-x}=64=4^{3}\Rightarrow -x=3\Rightarrow x=-3$
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 - 4.2 Exponential Functions - 4.2 Exercises - Page 431: 7
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