Use the Second Derivative Test to Find Any Extrema and Saddle Points: f(x,y) = -4x^2 + 8y^2 - 3

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Use the Second Derivative Test to Find Any Extrema and Saddle Points: f(x,y) = -4x^2 + 8y^2 - 3

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How did you compute fxy=0? I mean how did that happen

emanueljegoserrano
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Why wasn't (2, 1) and (-2, -1) candidates for points to check the type of extrema?

kiliankraus