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

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

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

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

extreme points

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

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}} = 12 y^{2}

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

2 x^{2} + 4 x + 1

P (r, y) = (r + 2 1 + m^{2}) y

f (x) = - x^{2} + 6 x - 4

f (x) = x^{3} - 12 x + 11

f (x) = (4 - 2) (4 - 6)^{3} + 8

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