Answer
$12r^2+r-7$.
Work Step by Step
The given polynomial is
$=(9r^2+4r-7)+(3r^2-3r)$
Clear the parentheses.
$=9r^2+4r-7+3r^2-3r$
Group like terms.
$=9r^2+3r^2+4r-3r-7$
Combine like terms.
$=12r^2+r-7$.
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 - 7.1 - Adding and Subtracting Polynomials - Exercises - Page 362: 28
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