Afunction is given by y =-2x3-3x2 +36x-12. determine the finite values of x at which any local maxima or minima occur and determine the corresponding values of y .what is the lower value (positive number is bigger than negative number) of x at which local maxima or minima occur? what is the value of y for this value of x? what is the bigger value (positive number is bigger than negative number) of x at which local maxima or minima occur? what is the value of y for this value of x?