Answer
$x=4$ or $x=-4$.
Work Step by Step
$x^2-16=x^2+4x-4x-16=x(x+4)-4(x+4)=(x+4)(x-4)$
Thus $x=4$ or $x=-4$.
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 8 - Review Exercises - Page 657: 23
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