Answer
$$8y^2-5y+6.$$
Work Step by Step
We simplify by adding the constant terms as follows
$$-15+8+13=6,$$
adding the $y$-terms,
$$-3y-6y+4y=-5y$$
adding the $y^2$-terms,
$$4y^2+7y^2-3y^2=8y^2.$$
The result is
$$8y^2-5y+6.$$
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: 33
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