Given f(x) = -3x²+x-7 and g(x) = 5x + 11, find: a) (f + g)(x) b) the domain, in interval notation, of (f + g)(x) c) (f - g)(x) d) the domain, in interval notation, of (f - g)(x) e) (f. g)(x) f) the domain, in interval notation, of (f g)(x)