-3x^2+6x+12 xy-3y^2+2y^3+6 local maxima

[levani]

1) f(x,y) = -3x^2+6x+12 xy-3y^2+2y^3+6 - local maxima.

2) f(x,y) = 2x^2 + 4x - 4xy -2y^3 +y^2 -15 - local minima.

please help me!

 

[stapel]

1) f(x,y) = -3x^2+6x+12 xy-3y^2+2y^3+6 - local maxima.

2) f(x,y) = 2x^2 + 4x - 4xy -2y^3 +y^2 -15 - local minima.

please help me!

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