Find the critical points and classify them as local maxima, local minima, saddle points, or none of these. f(x, y) = (x+y)(xy +

Question

Find the critical points and classify them as local maxima, local minima, saddle points, or none of these.
f(x, y) = (x+y)(xy + 9)
(x, y)=________   (smaller x-value)
(x, y) =_______    (larger x-value)

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