Answer
$(10y-7)(10y+7)$
Work Step by Step
$ 100y^{2}-49\qquad$...recognize the difference of two squares: $a^{2}-b^{2}=(a-b)(a+b)$
$=(10y)^{2}-7^{2}$
$=(10y-7)(10y+7)$
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 6 - Review Exercises - Page 480: 63
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