Answer
$21x^2-9y^2-20xy$
Work Step by Step
Given: $(7x-9y)(3x+y)$
Need to the multiply the polynomials.
$=7x(3x+y)-9y(3x+y)$
$=21x^2+7xy-27xy-9y^2$
Hence, $=21x^2-9y^2-20xy$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 5 - Test - Page 401: 10
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