# Chapter 1 - Section 1.3 - Algebraic Expressions - 1.3 Exercises: 55

$x^{4}-a^{4}$

#### 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.

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