Answer
$r=-3$
Work Step by Step
Solution:
$2^{r}=\frac{1}{8}$
$2^{r}=\frac{1}{2^{3}}$
$2^{r}=2^{-3}$
$r=-3$
Check:
$2^{-3}=\frac{1}{8}$?
$\frac{1}{8}=\frac{1}{8}$.
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 5 - Exponential Functions - 5.2 Solving Equations Using Exponent Rules - 5.2 Exercises - Page 437: 18
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