Find the absolute maximum and minimum values of the function over the indicated interval, and indicate the x-values at which they occur. f(x) = x² − 8x −6; [3,6] Find the first derivative of f. f'(x) = (Simplify your answer.) The absolute maximum value is at x = (Use a comma to separate answers as needed.) The absolute minimum value is at x = (Use a comma to separate answers as needed.)