Simplify 3r+n^2-r+5-2n+2

First combine like terms.

3r, - r, = like terms

-2n,+n = like terms

+5, + 2 = like terms

n^2 = unlike term

Combine the like terms

Put them in standard form (exponent first, alphabetically ordered variables, constants)

n^2 - 2r - 1n + 7