Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 7 - Section 7.2 - Rational Exponents - Exercise Set: 19

Answer

16

Work Step by Step

We know that $a^{\frac{m}{n}}=(\sqrt[n] a)^{m}$ (where m and n are positive integers greater than 1 with $\frac{m}{n}$ in simplest form and $\sqrt[n] a$ is a real number). Therefore, $(-64)^{\frac{2}{3}}=(\sqrt[3] -64)^{2}=(-4)^{2}=16$ We know that $\sqrt[3] -64=-4$ because $(-4)^{3}=-64$
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