a. 4x2 + 92 = 8. Find the maximum and minimum values of f(x, y) = xy under the constraint Jy b. Find the maximum and minimum values of f(x, y) = x2 + y2 under the constraint 24 + 24 = 2. c. Find the maximum and minimum values of f(x, y) = x2 + 3y2 + 100 under the constraint 8x + 6y = 88, in the first quadrant x 2 0 and y 2 0