Answer
$3(x-1)(x+2)$
Work Step by Step
$(x-1)(x+2)^{2}-(x-1)^{2}(x+2)=(x-1)(x+2)[(x+2)-(x-1)]=3(x-1)(x+2)$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter P, Prerequisites - Section P.6 - Factoring - P.6 Exercises - Page 43: 103
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