Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 5 - Test: 26

Answer

$x^{4}-81b^{2}$

Work Step by Step

$(x^{2}-9b)(x^{2}+9b)=$ $x^{2}(x^{2}+9b)-9b(x^{2}+9b)=$ $x^{4}+9bx^{2}-9bx^{2}-9b(9b)=$ $x^{4}-81b^{2}$
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