Given the functions, f(x) = 2x^2 + 2 and g(x) = 3x + 1, perform the indicated operation. When applicable, state the domain restriction.

A)2x2 - 3x + 1

B)2x2 - 3x + 3

C)5x3 + 2x2 + 2

D)6x3 + 6x + 3