Answer
$(r+8)(r-8)$
Work Step by Step
$r^{2}-64=$
...rewrite $64$ as a square.
$=r^{2}-8^{2}$
...factor using the rule for a difference of two squares.
($a^{2}-b^{2})=(a+b)(a-b),\qquad a=r,\ b=8$)
$=(r+8)(r-8)$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 8 - Polynomials and Factoring - Chapter Review - Page 538: 61
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