Answer
$x^{2}-9y^{2}$
Work Step by Step
$(x+3y)(x-3y)$
Special product: $a^{2}-b^{2}$
Substitute: $a=x$ and $b=3y$
$(x)^{2}-(3y)^{2}$
Simplify
$x^{2}-9y^{2}$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Review - Page 330: 73
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