Answer
$-47$
Work Step by Step
Substituting $x=2$ and $y=-3$, the given expression, $
xy^3-xy+1
,$ evaluates to
\begin{array}{l}\require{cancel}
(2)(-3)^3-(2)(-3)+1
\\\\=
(2)(-27)-(-6)+1
\\\\=
-54+6+1
\\\\=
-48+1
\\\\=
-47
.\end{array}
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 5 - Section 5.4 - Polynomials in Several Variables - Exercise Set - Page 375: 3
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