Answer
$9m-21$.
Work Step by Step
The given expression is
$=2m-7(3-m)$
Use distributive property.
$=2m-21+7m$
Use commutative property of addition.
$=2m+7m-21$
Simplify.
$=9m-21$.
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 7 - Polynomial Equations and Factoring - Maintaining Mathematical Proficiency - Page 355: 5
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