Suppose f(x,y)=x2+y2−8x−6y+5
(A) How many critical points does f have iR2?
(B) If there is a local minimum, what is the value of the discriminant D at that point? If there is none, type N.
(C) If there is a local maximum, what is the value of the discriminant D at that point? If there is none, type N.
(D) If there is a saddle point, what is the value of the discriminant D at that point? If there is none, type N.
(E) What is the maximum value of f oR2? If there is none, type N.
(F) What is the minimum value of f oR2? If there is none, type N.
