Determine the local extrema of the function.
-$f(x, y)=x^{3}+y^{3}-9 x y$
A) $f(2,2)=-20$, minimum
B) $f(1,1)=-7$, minimum
C) $f(3,3)=-27$, minimum
D) no local extrema

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The Answer of Determine the local extrema of the function.
-$f(x, y)=x^{3}+y^{3}-9 x y$
A) $f(2,2)=-20$, minimum
B) $f(1,1)=-7$, minimum
C) $f(3,3)=-27$, minimum
D) no local extrema

Determine the Local Extrema of the Function f(x,y)=x3+y3−9xyf(x, y)=x^{3}+y^{3}-9 x yf(x,y)=x3+y3−9xy

Determine the Local Extrema of the Function $f(x, y)=x^{3}+y^{3}-9 x y$