Answer
$9a^{2}-b^{2}$
Work Step by Step
Step 1: $(3a-b)(3a+b)$
Step 2: Using a special product to multiply, $(3a-b)(3a+b)=(3a)^{2}-(b)^{2}$
Step 3: $(3a)^{2}-(b)^{2}=9a^{2}-b^{2}$
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 - Practice - Page 386: 12
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