Hello, I'm having trouble understanding this question and would really appreciate an explanation. It has already been knocked back twice. Please don't pass on it.

4. Consider the function HI, 3;) = 2:13\" + y\" 3:22: (a) (4 points] Find the critical points of f, i.e. where Vf : 0 or where one of the partial derivatives doesn't exist. Use the Hessian or its determinant to classify each of these critical points. Calculate the 1value of f at each of these points