Answer
$x^{4}-a^{4}$
Work Step by Step
Use the rule $(A+B)(A-B)=A^{2}-B^{2}$. The middle terms $a^{2}x^{2}-a^{2}x^{2}$ will cancel out.
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 1 - Section 1.3 - Algebraic Expressions - 1.3 Exercises - Page 34: 55
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