Precalculus (6th Edition)

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: 7

Answer

$-3$

Work Step by Step

$\left( \dfrac {1}{4}\right) ^{x}=4^{-x}=64=4^{3}\Rightarrow -x=3\Rightarrow x=-3$
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