Answer
$\frac{1}{2}$.
Work Step by Step
The given expression is
$=x^y$
Substitute $x=2$ and $y=-1$.
$=(2)^{-1}$
Use the law of exponents $(a)^{-n}=\frac{1}{a^{ n}}$.
$=\frac{1}{(2)^{1}}$
Simplify.
$=\frac{1}{2}$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Appendix A - Review - A.1 Algebra Essentials - A.1 Assess Your Understanding - Page A12: 117
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