Question: In Exercises, both first partial derivatives of the function f (x, y) are zero at the given points. Use the second-derivative test to determine the

In Exercises, both first partial derivatives of the function f (x, y) are zero at the given points. Use the second-derivative test to determine the nature of f (x, y) at each of these points. If the second-derivative test is inconclusive, so state.

f (x, y) = 3x2 - 6xy + y3 - 9y; (3, 3), (-1, -1)

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