# Chapter 1 - Functions and Limits - 1.1 Four Ways to Represent a Function - 1.1 Exercises: 31

{ x | x $\ne$ ± 3}

#### Work Step by Step

Since division by 0 is not allowed, we must have: x² - 9 $\ne$ 0 x² $\ne$ 9 x $\ne$ ± $\sqrt 9$ x $\ne$ ± 3

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