(a) Find the critical point of f(x,y) = (2x-y) (x+4y). (x, y) = 6x (b) Find the discriminant, D(x, y) for the function. D(x, y) = 0 what is the value of the discriminant at the critical point? D= (48 0+14(0))-8-14(0)2 What does this tell us about the critical point? The discriminant doesn't tell us anything (c) Sketch contours near the critical point to determine, or confirm, whether it is a local maximum, a local minimum, a saddle point, or none of t The critical point is a saddle point