Question: Find all the critical points and determine whether each is a local maximum, local minimum, a saddle point, or none of these. f(x, y) =

Find all the critical points and determine whether each is a local maximum, local minimum, a saddle point, or none of these.

f(x, y) = 400 − 3x2 − 4x + 2xy − 5y2 + 48y

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