Answer
$9b^{4}-49$
Work Step by Step
Because $(a-b)(a+b)=a^{2}-b^{2}$, so:
$(3b^{2}+7)(3b^{2}-7)=(3b^{2})^{2}-7^{2}$
$=9b^{4}-49$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 10 - Radical Expressions and Equations - Get Ready! - Page 611: 10
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