I'm not sure how to approach this problem:(adsbygoogle = window.adsbygoogle || []).push({});

Find the range of f(x,y) = Ax^2 + 2Bxy + Cy^2 (Answer will be in terms of A, B, and C)

Thanks! And we haven't yet been allowed to use partial derivatives, so they can't be used to solve it.

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# Range of 3d function?

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