What is the extreme f(x,y)=sqrt(x^2+y^2+9) ?

The extreme f(x,y)=sqrt(x^2+y^2+9) is Minimum(0,0)

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extreme f(x,y)=sqrt(x^2+y^2+9)

extreme

Minimum (0, 0)

Solution steps

Find the critical points:

(0, 0)

\frac{\partial ^{2} f}{\partial x ^{2}} = \frac{x ^{2} + 9}{( x ^{2} + y ^{2} + 9 ) x ^{2} + y ^{2} + 9}

D (x, y) = \frac{9}{( x ^{2} + y ^{2} + 9 ) ^{2}}

Check the sign of at each critical point

Check critical point

(0, 0) :

Minimum

Minimum (0, 0)

What is the extreme f(x,y)=sqrt(x^2+y^2+9) ?
The extreme f(x,y)=sqrt(x^2+y^2+9) is Minimum(0,0)