I believe that answer would be C. x - 3
(3x - 2) - (2x + 1) = x - 3
C x - 3
note that (f - g )(x) = f( x) - g( x) = 3x - 2 - ( 2x + 1) = 3x - 2 - 2x - 1 = x - 3
