Question: Supposef (x, y) = 23 - y' - 3x + 9y. How many of the critical points of f are saddle points

Supposef (x, y) = 23 - y' - 3x + 9y.

How many of the critical points of f are saddle points

Supposef (x, y) = 23 - y' - 3x + 9y. How many of the critical points of f are saddle points

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