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Homework Statement
I was given the following level curve (image is attached). I need to find the critical points and classify them (local max, min, saddle).
The Attempt at a Solution
I can find the points easily enough. Saddle at (-1,0), and then locals at each of the three circles. However, I cannot figure out if they are local max or mins. How can I tell from the surface if it is a max or a min? To me it looks as though it could go either way.
Thanks,
Chris