Problem. 5 : Find the local maximum and minimum values and saddle point(s) of the function f(x, y) = 8x3 - 24x + 24xy. (If an answer does not exist, enter "DNE". ) local maximum value = 16 V at (x, y) = -1 0 V local minimum value = -16 V at (x, y) = 1 O V saddle point (x, y) with smaller y-value = 0 V -1 V saddle point (x, y) with larger y-value = 0 V V