Answer
$-13$
Work Step by Step
Substitute the given values of the variables to obtain:
$x^2-2y^2+3xy
\\=5^2-2(-2)^2+3(5)(-2)
\\=25-2(4)+(-30)
\\=25-8-30
\\=17-30
\\=-13$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 4 - Polynomials - 4.7 Polynomials in Several Variables - 4.7 Exercise Set - Page 283: 11
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