Q12

If f(x, y) has the following second partial derivatives at a critical value (a, b), determine if at the critical value the function has a local minimum, a local maximum, or a saddle point. hint: use D = fxx . fyy - (fry)? a) fix = 2, fyy = 4 and fry = 3 b) for = -3, fyy = -54 and fry = 2