Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 9 - Roots and Radicals - 9.1 - Roots and Radicals - Concept Quiz 9.1 - Page 401: 7



Work Step by Step

The text states that every positive real number does indeed have two square roots; one is positive and the other is negative. They are opposites of each other. We illustrate this rule using an example. For example, $\sqrt 4$ has two roots, $2$ and $-2$. Both $2$ and $-2$, when raised to the power of $2$, result in $4$. Therefore, the question statement is true.
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