Answer
$15{a^3} + {a^2} - 3a +16$
Work Step by Step
$10{a^3} - 8{a^2} + 4a +9$
+ $5{a^3} + 9{a^2} - 7a +7$
------------
$15{a^3} + {a^2} - 3a +16$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Section 5.4 - Adding and Subtracting Polynomials - Exercise Set - Page 371: 15
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