What is the extreme f(x,y)=72y^2+x^2-x^2y ?

The extreme f(x,y)=72y^2+x^2-x^2y is Minimum(0,0),Saddle(12,1),Saddle(-12,1)

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extreme f(x,y)=72y^2+x^2-x^2y

extreme

Minimum (0, 0), Saddle (12, 1), Saddle (- 12, 1)

Solution steps

Find the critical points:

(0, 0), (12, 1), (- 12, 1)

\frac{\partial ^{2} f}{\partial x ^{2}} = 144

D (x, y) = 144 (2 - 2 y) - 4 x^{2}

Check the sign of at each critical point

Check critical point

(0, 0) :

Minimum

Check critical point

(12, 1) :

Saddle

Check critical point

(- 12, 1) :

Saddle

Minimum (0, 0), Saddle (12, 1), Saddle (- 12, 1)

What is the extreme f(x,y)=72y^2+x^2-x^2y ?
The extreme f(x,y)=72y^2+x^2-x^2y is Minimum(0,0),Saddle(12,1),Saddle(-12,1)