Answer
$16x^{2}+6x-8$
Work Step by Step
$9x^{2}+9x-4 + (7x^{2}-3x-4)$
$= 9x^{2}+9x-4 + 7x^{2}-3x-4$
Combine like terms.
$= 9x^{2}+ 7x^{2}+9x-3x-4-4 $
$= 16x^{2}+6x-8$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Section 5.3 - Polynomials and Polynomial Functions - Exercise Set - Page 280: 70
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