The Level Curves of F(x, Y)are Shown in the Picture

question 6

Essay

The level curves of f(x, y)are shown in the picture below. (a)Estimate the global maximum and minimum of f on the closed triangular region D with vertices at (-1, -1), (2, -1)and (-1, 2).
(b)Find the critical point(s)of f in the interior of the region D.
(c)Find the critical point(s)of f along the boundary of D.

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