Answer
$5$.
Work Step by Step
The given expression is
$=x^2+y^2$
Substitute $x=2$ and $y=-1$.
$=(2)^2+(-1)^2$
Use the law of exponents $(a)^{n}=a^{n}$
$=2^2+1^2$
Use $2^2=4$
$=4+1$
Simplify.
$=5$.
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: 109
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