Answer
$(3x-y)(x+7)$
Work Step by Step
$3x^2+21x-xy-7y=3x^2-xy+21x-7y=x(3x-y)+7(3x-y)=(3x-y)(x+7)$
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 - Section 5.5 - Factoring Special Forms - Exercise Set - Page 374: 142
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