The Function F(x, Y)has a Local Maximum at (-1, 1) $f _ { x y } ( - 1,1 )$

question 53

Multiple Choice

The function f(x, y) has a local maximum at (-1, 1) . What can you say (if anything) about the values of $f _ { x y } ( - 1,1 )$ ?

• A)Nothing.
• B)It is undefined or equal to zero.
• C)It cannot be greater than zero.
• D)It is equal to zero.

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