Answer
$5x^2+18x-22$
Work Step by Step
We simplify by removing the parentheses and then add the like terms as follows:
$$
(3x^2+ 7) + (6x - 7) + (2x^2 + 5x - 13) +(7x- 9)\\
=3x^2+ 7 +6x - 7 + 2x^2 + 5x - 13 +7x- 9\\
=5x^2+18x-22
.$$
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: 29
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