= Problem 7. - (8 points) Consider the function f(x) = 13r.4 + 1x3 + 445. l (a) (34%) The two critical values are x = . (Separate them with a comma) (bl (66%) Using the First Derivative Test, we find that to the left of the smaller critical point , f ' (x) is Choose a response v As a result the smaller critical point is l Choose a response 1 critical point .f'(x) is LChoose a response v , ; As a result the larger critical point isi Choose a response vj. L, l , and to the right of the smallest critical point , f ' (x) is . ' Then, we nd that to the left of the larger critical point , f ' (x) is Choose a response V L and to the right of the larger 1 l l l ' r''_ H l