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I have the scalar function

[tex]T(r)= 2x^{2} - 4x +y^2 +4y-3z^{2}[/tex] (r is obviously a vector)

I have the critical point (1,-2,0) but I'm not sure how to work out if its a min/max/saddle. I'm familiar with doing it for functions in 2 variables.

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# Homework Help: Critical points of function in 3 variables

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