Answer
$(y-7)(x+3)$
Work Step by Step
$ xy-7x+3y-21\qquad$...factor in pairs.
$=(xy-7x)+(3y-21)$
$=x(y-7)+3(y-7)$
$=(y-7)(x+3)$
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 6 - Section 6.5 - A General Factoring Strategy - Exercise Set - Page 462: 83
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