Answer
$9b^{2}-36y^{2}$
Work Step by Step
Using the product of sum and difference of two terms $(a+b)(a-b)=a^{2}-b^{2}$,
$(3b-6y)(3b+6y)=(3b)^{2}-(6y)^{2}=9b^{2}-36y^{2}$.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Appendix A - Exercise Set - Page 976: 43
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