What is the extreme L(x,y)=4+x^3+y^3-3xy ?

The extreme L(x,y)=4+x^3+y^3-3xy is Saddle(0,0),Minimum(1,1)

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extreme L(x,y)=4+x^3+y^3-3xy

extreme points

L (x, y) = 4 + x^{3} + y^{3} - 3 x y

Saddle (0, 0), Minimum (1, 1)

Solution steps

Find the critical points:

(0, 0), (1, 1)

\frac{\partial ^{2} f}{\partial x ^{2}} = 6 y

D (x, y) = 36 x y - 9

Check the sign of at each critical point

Check critical point

(0, 0) :

Saddle

Check critical point

(1, 1) :

Minimum

Saddle (0, 0), Minimum (1, 1)

What is the extreme L(x,y)=4+x^3+y^3-3xy ?
The extreme L(x,y)=4+x^3+y^3-3xy is Saddle(0,0),Minimum(1,1)