Answer
$x=-1$
Work Step by Step
$8^{x-1}=\frac{1}{64}$
$8^{x-1}=64^{-1}$
$8^{x-1}=(8^{2})^{-1}$
$8^{x-1}=8^{-2}$
$x-1=-2$
$x-1+1=-2+1$
$x=-1$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 12 - Test - Page 910: 17
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