Answer
4$r^{2}$ -9$s^{2}$
Work Step by Step
(2r-3s)(2r+ 3s) the sum and difference of the same two terms
$(2r)^{2}$ - $(3s)^{2}$
4$r^{2}$ -9$s^{2}$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Section 5.6 - Special Products - Exercise Set - Page 388: 79
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