Answer
$(a+3)(b-c)$
Work Step by Step
$ab-3c-ac+3b=\\=ab+3b-ac-3c\\=b(a+3)-c(a+3)\\=(a+3)(b-c)$
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 5.3 - Greatest Common Factors and Factoring by Grouping - Exercise Set - Page 348: 70
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