Let f be a function that admits continuous second partial derivatives, for which it is known that: Vf(x, y) = (913 - Ary], 1673 - Arly + 96y? + 14Ay) fex = 2712 - 4y fyy = 48y2 - 4r + 192y + 144 y fry = -8ry Consider the critical point (a, b) with positive x-coordinate, such that said critical point generates a local minimum. Find the value of a: Find the value of b