## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

addition sign $(+)$
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 $(+)$.