1. The problem statement, all variables and given/known data Find (x,y) which maximizes f(x,y) for x ≥ 0. f(x,y) = e-x - e-2x + (1 - e-x)(4/5 - (3/4 - y)2) 2. Relevant equations 3. The attempt at a solution Due to the question prior to this one, I know all the first order and second order partial derivatives of the formula. I do not understand what to do to find (x.y) that maximizes f(x,y). I thought that maybe it basically means finding the global maximum, except using the second derivative test I found that there is no global max or min, but only a saddle point. Is this the right approach? If so, I can show my work for you guys. Thanks!