Answer
$49-4y^{2}$
Work Step by Step
We know that $(a+b)(a-b)=a^{2}-b^{2}$. Using this same rule, we obtain:
$(7-2y)(7+2y)=(7)^{2}-(2y)^{2}=49-4y^{2}$
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 5 - Exponents and Polynomials - Chapters 1-5 Cumulative Review Problem Set - Page 233: 24
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