Match the conclusion of the D-test D(x,y) < 0 (x,y) is a maximum D(x, y) > 0, f_xx (x,y) < 0 (x,y) is a saddle point D(x, y) > 0, f_xx (x.y) < 0. You selected (x,y) is a saddle point. D(x, y) > 0, f_xx (x,y) > 0 (x,y) is a minimum D(x, y) = 0 the test is inconclusive

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