Answer
$(x^{2}-3)(x^{2}+3)$
Work Step by Step
$x^{4}-9$
$\qquad$...recognize the difference of two squares: $a^{2}-b^{2}=(a-b)(a+b), a=x^{2}, b=3$
$=(x^{2}-3)(x^{2}+3)$
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 6 - Section 6.4 - Factoring Special Forms - Concept and Vocabulary Check - Page 453: 13
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