Answer
$49x^2-9y^2$
Work Step by Step
$$(7x+3y)(7x-3y)$$ The product of the sum and the difference of two terms can be found using this formula: $(a+b)(a-b) = a^2-b^2$. $$=(7x)^2-(3y)^2$$ $$=49x^2-9y^2$$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter P - Prerequisites: Fundamental Concepts of Algebra - Exercise Set P.4 - Page 61: 80
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