Answer
$8x^2+6x+4$
Work Step by Step
We do the subtraction as follows:
$$
( 4x^2 + 6 )-(-4x^2 - 6x +2)\\
=4x^2 + 6 +4x^2+ 6x -2\\
=8x^2+6x+4
.$$
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: 54
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