keep getting the wrong answer, will give a super good rating if done correctly!

1. For the given functions find and classify all critical points and then evaluate z at those points (6 marks each). f(x, y) = x2 + 2xy -y2 - 3x - 5y - 2Using the following function: f(x, y) = x3 - x2y2 + x2y3 + 2y + 1 Find: (4 marks) az a. aplx=-1 y=2 azz b. aydx a3 z C. axdydx