The necessary condition for optimality in a two-variable unconstrained function is that
A) both partial derivatives must be non-negative
B) at least one of the partial derivatives must be negative
C) the partial derivatives must be equal and negative
D) both partial derivatives must be negative

Question

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The Answer of The necessary condition for optimality in a two-variable unconstrained function is that
A) both partial derivatives must be non-negative
B) at least one of the partial derivatives must be negative
C) the partial derivatives must be equal and negative
D) both partial derivatives must be negative

The Necessary Condition for Optimality in a Two-Variable Unconstrained Function