1. The problem statement, all variables and given/known data Find the first-octant point P(x,y,z) on the surface closest to the given fixed point Q (0,0,0). The surface x2y2z=4 2. Relevant equations is the distance along PQ. EDIT: 3. The attempt at a solution I get stuck here every time. I feel like I'm just selling myself short here, but I don't know how to resolve the situation for when the critical point has a variable in it.