Answer
$9x^{4}-1$
Work Step by Step
$(3x^{2}+1)(3x^{2}-1)$
To evaluate this product, use the following formula:
$(a-b)(a+b)=a^{2}-b^{2}$
Here, $a=3x^{2}$ and $b=1$
$(3x^{2}+1)(3x^{2}-1)=(3x^{2})^{2}-1^{2}=9x^{4}-1$
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: 48
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