Let f (x) = 3x - 1 and g(x) = x - x Find (f - g) (x) and the restriction for the domain. O (f-g) (x) = x+2x-1 No restriction for the domain. O (f-g) (x) = x+4x-1 Domain restriction: x 1, 0, 1 O (f-g) (x) = x+4x-1 Domain restriction: x + O(f-g) (x) = x+4x-1 No restriction for the domain.