Answer
$25 - 49x^2$
Work Step by Step
RECALL:
$(a-b)(a+b)=a^2-b^2$
Use the formula above with $a=5$ and $b=7x$ to obtain:
$=5^2-(7x)^2
\\=25 - 49x^2$
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: 35
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