What is the extreme f(x,y)=x^2-9xy-y^2 ?

The extreme f(x,y)=x^2-9xy-y^2 is Saddle(0,0)

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extreme f(x,y)=x^2-9xy-y^2

extreme points

f (x, y) = x^{2} - 9 x y - y^{2}

Saddle (0, 0)

Solution steps

Find the critical points:

(0, 0)

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

D (x, y) = - 85

Check the sign of at each critical point

Check critical point

(0, 0) :

Saddle

Saddle (0, 0)

x θ

f (x) = 6 x^{3} - 18 x - 4

f (x, y) = e^{x + y + 8}

f (x, y) = 2 x^{2} + 2 x y + y^{2} + 2 x - 4

f (x) = 21 - 4 x - \frac{4}{x}

What is the extreme f(x,y)=x^2-9xy-y^2 ?
The extreme f(x,y)=x^2-9xy-y^2 is Saddle(0,0)