## Functions Modeling Change: A Preparation for Calculus, 5th Edition

Published by Wiley

# Chapter 2 - Functions - 2.2 Domain and Range - Exercises and Problems for Section 2.2 - Exercises and Problems - Page 82: 15

#### Answer

All real numbers except the numbers between -2 and 2.

#### Work Step by Step

To find domain restrictions, we look for any numbers that make the denominator of a fraction 0 or the expression under the square root sign negative. Thus, we find: $$x^2=4 \\ x=\pm2$$

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