Answer
$11x^3+7x^2-12x-4$; Degree 3
Work Step by Step
$$(-6x^3+5x^2-8x+9)+(17x^3+2x^2-4x-13)$$ $$=(-6x^3+17x^3)+(5x^2+2x^2)+(-8x+(-4x))+(9+(-13))$$ $$=11x^3+7x^2-12x-4$$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter P - Prerequisites: Fundamental Concepts of Algebra - Exercise Set P.4 - Page 61: 9
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