o o Exercise 7.6.11 Given the three points (1,4), (5,2), and (3,-2), (x 1>+ (y4)>+ (x 5)*+ (y 2)2 + (x 3)2 + (y+ 2)2 is the sum of the squares of the distances from point (x,y) to the three points. Find x and y so that this quantity is minimized. Exercise 7.6.12 Suppose that f(x,y) = x> +y> + kxy. Find and classify the critical points, and discuss how they change when k takes on different values