What is the extreme f(x,y)= 1/(sqrt(25-x^2-y^2)) ?

The extreme f(x,y)= 1/(sqrt(25-x^2-y^2)) is Minimum(0,0)

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extreme f(x,y)= 1/(sqrt(25-x^2-y^2))

extreme points

f (x, y) = \frac{1}{25 - 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} + 25}{( 25 - x ^{2} - y ^{2} ) ^{\frac{5}{2}}}

D (x, y) = \frac{- 2 x ^{4} - 4 x ^{2} y ^{2} + 25 x ^{2} - 2 y ^{4} + 25 y ^{2} + 625}{( - x ^{2} - y ^{2} + 25 ) ^{5}}

Check the sign of at each critical point

Check critical point

(0, 0) :

Minimum

Minimum (0, 0)

f (x) = 1 - x^{2}

f (x, y) = 4 x^{2} y + 2 x y^{2} - 12 x y - 5

f (x) = x^{3} + \frac{48}{x}

f (x, y) = \frac{y ^{2}}{y + x ^{2}}

f (x) = \frac{1}{3} x^{3} + \frac{1}{2} x^{2} - 6 x + 8

What is the extreme f(x,y)= 1/(sqrt(25-x^2-y^2)) ?
The extreme f(x,y)= 1/(sqrt(25-x^2-y^2)) is Minimum(0,0)