Answer
$-4$.
Work Step by Step
The given expression is
$=2xy^{-1}$
Use the law of exponents $a^{-n}=\frac{1}{a^{n}}$
$=\frac{2x}{y^{1}}$
Substitute $x=2$ and $y=-1$.
$=\frac{2(2)}{(-1)^{1}}$
Simplify.
$=\frac{4}{-1}$
$=-4$.
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: 107
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