Answer
(r+6)(r-7)
Work Step by Step
$r^{2}$ -r -42=$r^{2}$ -7r +6r-42=
r(r-7)+6(r-7)=(r+6)(r-7)
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 9 - Cumulative Review - Page 677: 21
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