Answer
$10x^2-21xy+8y^2$
Work Step by Step
Using the FOIL Method, $(a+b)(c+d)=ac+ad+bc+bd$, the given expression simplifies to
\begin{align*}
&
(5x-8y)(2x-y)
\\\\&=
10x^2-5xy-16xy+8y^2
\\\\&=
10x^2-21xy+8y^2
.\end{align*}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Section 5.4 - Multiplying Polynomials - Exercise Set - Page 289: 23
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