Answer
$4y^{4}-1$
Work Step by Step
$(2y^{2}-1)(2y^{2}+1)$
To evaluate this product, use the following formula:
$(a-b)(a+b)=a^{2}-b^{2}$
Here, $a=2y^{2}$ and $b=1$
$(2y^{2}-1)(2y^{2}+1)=(2y^{2})^{2}-(1)^{2}=4y^{4}-1$
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: 47
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