Answer
$a^{2}$ -49
Work Step by Step
( a-7 ) ( a + 7 ) the sum and differnce of the same two terms
$a^{2}$ - $7^{2}$
$a^{2}$ -49
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: 39
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