Answer
9$x^{2}$ -1
Work Step by Step
( 3x - 1 ) ( 3x + 1 ) the sum and difference of the same two terms
$(3x)^{2}$ - $1^{2}$
9$x^{2}$ -1
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: 43
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