Answer
The solutions are $x = 8,-8$
Work Step by Step
$x^2 - 64= 0$
$(x+8)(x-8) = 0$
$x-8= 0$
$x = 8$
OR
$x + 8= 0$
$x = -8$
The solutions are $x = 8,-8$
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 1 - Equations and Inequalities - 1.4 Quadratic Equations - 1.4 Exercises - Page 121: 20
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