Need help with 3 and 4

3) Use the First Derivative Test results from problem (2) to determine the local mins and maxs of the following functions. f (x) = 2x3 - 3x2 - 36x + 12 x 4 a- b- f (x ) : - 3x2 + 10 4 3 4) Use the Second Derivative Test to confirm the local mins and maxs of the following functions found in problem (3). a- f (x) = 2x3 -3x2 -36x +12 b- f ( x) = X 4 3 3x2 + 10