Answer
$$9a^3+4a^2 + 5a-5 .$$
Work Step by Step
We simplify by removing the parentheses and then add the like terms as follows:
$$ (2a^3 - a) + (4a^2 + 7a) + (7a^3 - a -5)\\ =2a^3 - a + 4a^2 + 7a+ 7a^3 - a -5\\ =9a^3+4a^2 + 5a-5 .$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 5 - Section 5.3 - Addition and Subtraction of Polynomials - Exercise - Page 221: 25
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