Let a 0, THEN f(b) > f(a). O IF ic E (a, b) such that f' (c) = 0, THEN f(b) = f(a). O ice (a, b) such that f(b) - f(a) = f'(c)(b -a) O IF f(b) > f(a), THEN ic E (a, b) such that f' (c) > 0