What is the extreme f(x,y)= 1/(sqrt(4-x^2-y^2)) ?

The extreme f(x,y)= 1/(sqrt(4-x^2-y^2)) is Minimum(0,0)

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

extreme f(x,y)= 1/(sqrt(4-x^2-y^2))

extreme points

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

Minimum (0, 0)

Solution steps

Find the critical points:

(0, 0)

\frac{\partial ^{2} f}{\partial x ^{2}} = \frac{2 y ^{2} - x ^{2} + 4}{( 4 - x ^{2} - y ^{2} ) ^{\frac{5}{2}}}

D (x, y) = \frac{- 2 x ^{4} - 4 x ^{2} y ^{2} + 4 x ^{2} - 2 y ^{4} + 4 y ^{2} + 16}{( - x ^{2} - y ^{2} + 4 ) ^{5}}

Check the sign of at each critical point

Check critical point

(0, 0) :

Minimum

Minimum (0, 0)

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