Given f(x) and g(x)= 3x + 12 x² - 25 x² - 25, 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)