tranthikhanhhuyen171 tranthikhanhhuyen171 11-04-2024 Mathematics Answered (a) Find the minimum value of the objective function z=9x^2+2y^2-3xy subject to the constraint x + y = 40. (b) Find the maximum value of the objective function -16x^2 - 2y^2+ 4x + 9y + 2xy subject to the constraint y= 4x