Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 2 - Section 2.3 - The Algebra of Functions - Exercise Set - Page 134: 76


Makes sense.

Work Step by Step

The statement is true since domain of $\sqrt x$ is all positive real numbers. The domain is also not including all the negative integers, and there is infinite number of negative integers (-1,-2,-3,-4,-5,...).
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