5. Let f be continuous on [a, b] and differentiable on (a, b). Assume that m f'(x) M for all x = (a,b). Show that m+M 2 X am+bM 2 f(x) - (b)+ f(b) + f (a) m+M bm +aM X 2 2 2 for all x = (a, b).