Suppose that the functions r and s are defined for all real numbers x as follows.
r（2） =3x-2
s（x）=x+2
Write the expressions for (r+s) (x) and (r-s) (x) and evaluate (r-s) (3).
(r+ s) (x) =
(r*s)(x) =
(r - s) (3) =
(r+ s) (x) = (3x-2) + (x+2) = 4x
(r- s) (x) = (3x-2) - (x+2) = 2x - 4
(r - s) (3) = (3(3) - 2) - (3 + 2) = 7 - 5 = 2