Answer
$9x^2-25y^2$
Work Step by Step
RECALL:
$(a+b)(a-b) = a^2-b^2$
Multiply the given expression using the formula above with $a=3x$ and $b=5y$ to obtain:
$=(3x)^2-(5y)^2
\\=9x^2-25y^2$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.4 - Polynomials - Exercise Set - Page 56: 71
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