## Elementary Algebra

Published by Cengage Learning

# Chapter 5 - Exponents and Polynomials - Chapters 1-5 Cumulative Review Problem Set - Page 233: 24

#### 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: $(7-2y)(7+2y)=(7)^{2}-(2y)^{2}=49-4y^{2}$

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