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consider the 2 variable function f(x,y) = 4 - x^2 - y^2 - 2x - 2y...

consider the 2 variable function f(x,y) = 4 - x^2 - y^2 - 2x - 2y + xy

a.) find the x,y location of all critical points of f(x,y)

b.) classify each of the critical points found in part a.)

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