Answer
$-7$
Work Step by Step
Recall the following rule:
$(a^{b})^{c}=a^{bc}$
Thus, we obtain:
$-\sqrt {49}=-\sqrt {7^{2}}=-(7^{2})^{\frac{1}{2}}=-7^{1}=-7$
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 9 - Roots and Radicals - Chapter 9 Review Problem Set - Page 430: 2
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