Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 6 - Radical Functions and Rational Exponents - 6-4 Rational Exponents - Practice and Problem-Solving Exercises - Page 388: 98

Answer

$2$

Work Step by Step

When a fraction is raised to a power, the exponent applies to both the numerator as well as the denominator. Let's rewrite the problem to reflect this: $=\dfrac{1^{-1/6}}{64^{-1/6}}$ We can break down the number $64$ into a smaller base raised to a power. The number $64$ breaks down to base $2$ raised to the $6th$ power: $=\dfrac{1^{-1/6}}{(2^{6})^{-1/6}}$ Since $1$ raised to any power is equal to $1$, then the numerator simplifies tp $1$ $=\dfrac{1}{2^{(6)(-1/6)}}$ Let us multiply the fractional exponent: $=\dfrac{1}{2^{-6/6}}$ $=\dfrac{1}{2^{-1}}$ Simplified expressions cannot have negative exponents. Use the rule $a^{-m}=\frac{1}{a^m}$ to obtain: $=\dfrac{1}{\frac{1}{2}}$ $=1 \cdot 2\\ =2$
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