Answer
$15x^{2}-xy-28y^{2}$
Work Step by Step
$(3x+4y)(5x-7y)$
$=3x(5x-7y)+4y(5x-7y)$
$=15x^{2}-21xy+20xy-28y^{2}$
$=15x^{2}-xy-28y^{2}$
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 3 - Exponents, Polynomials and Functions - Chapter Review Exercises - Page 287: 19
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