Answer
$x^{4}-81b^{2}$
Work Step by Step
$(x^{2}-9b)(x^{2}+9b)=$
$x^{2}(x^{2}+9b)-9b(x^{2}+9b)=$
$x^{4}+9bx^{2}-9bx^{2}-9b(9b)=$
$x^{4}-81b^{2}$
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 - Test - Page 409: 26
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