1. Calculate the relative maximum and minimum values and saddle point(s) of the function.

Z a. f(x, 9 - 2x + 4y- 4y b. f(x 47-x3. = 1 C. xy +a. f(x,y) = 1+4x -5y, Des la region triangular cerrada con vertices (0,0), (2,0)y(0,3) b. f(x,y) = xy', D = {(x,y)|x > 0,y >0,x'+y>