What is the extreme f(x,y)=x^4-4xy+2y^2 ?

The extreme f(x,y)=x^4-4xy+2y^2 is Saddle(0,0),Minimum(-1,-1),Minimum(1,1)

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extreme f(x,y)=x^4-4xy+2y^2

extreme points

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

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

Solution steps

Find the critical points:

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

\frac{\partial ^{2} f}{\partial x ^{2}} = 4

D (x, y) = 48 x^{2} - 16

Check the sign of at each critical point

Check critical point

(0, 0) :

Saddle

Check critical point

(- 1, - 1) :

Minimum

Check critical point

(1, 1) :

Minimum

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

f (x, y) = ln (x) y

f (x, y) = 1 - \frac{x ^{2}}{4} - \frac{y ^{2}}{4}

f (x) = x^{3} - 3 x^{2} - 24 x + 32

f (x, y) = 1 - 9 x^{2} - y^{2}

f (x) = x + cos (2 x)

What is the extreme f(x,y)=x^4-4xy+2y^2 ?
The extreme f(x,y)=x^4-4xy+2y^2 is Saddle(0,0),Minimum(-1,-1),Minimum(1,1)