Answer
81$w^{2}$-49
Work Step by Step
In order to simplify the product (3w+7)(3w-7) we must apply the rule that states that
(a+b)(a-b)=$a^{2}$-$b^{2}$, and we'll set a=3w and b=7. Therefore,
(3w+7)(3w-7)=$(9w)^{2}$-$7^{2}$
=81$w^{2}$-49
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 8 - Polynomials and Factoring - 8-5 Factoring X(squared) + bx + c - Mixed Review - Page 505: 67
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