Answer
addition sign $(+)$
Work Step by Step
Subtract each term of the subtrahend to obtain:
$(-2n^3+5)-(n^2-2)
\\=-2n^3+5-n^2-(-2)
\\=-2n^3+5-n^2+2$
Thus, the missing operation is the addition sign $(+)$.
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 4 - Polynomials - 4.4 Addition and Subtraction of Polynomials - 4.4 Exercise Set - Page 259: 8
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