Question description

Find the critical point(s) of the function. Then use the second derivative test to classify the nature of each point, if possible. (If an answer does not exist, enter DNE.)f(x, y) = x3 + y2 − 2xy + 5x − 6y + 4I have the first partial derivatives. I just don’t know where to go from here. Do I get rid of my y? What do I do with this?

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