Answer
A. ($x^{2}$ - 1)($x^{2}$ + 1)
Work Step by Step
$x^{4}$ - 1 is a difference of squares, for which $x^{2}$ - $y^{2}$ = (x + y)(x - y), so the expression factors to ($x^{2}$ - 1)($x^{2}$ + 1).
We can also use FOIL to check.
College Algebra (11th Edition)
by Lial, Margaret L.; Hornsby John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671791
ISBN 13:
978-0-32167-179-0
Chapter R - Section R.4 - Factoring Polynomials - R.4 Exercises - Page 39: 71
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