Answer
$(b-6)(a+7)$
Work Step by Step
Using factoring by grouping, then,
\begin{array}{l}
ab-6a+7b-42
\\=
(ab-6a)+(7b-42)
\\=
a(b-6)+7(b-6)
\\=
(b-6)(a+7)
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Sections 5.1-5.7 - Integrated Review - Operations on Polynomials and Factoring Strategies - Page 313: 33
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