What is the extreme f(x,y)=xy+1/x+1/y ?

The extreme f(x,y)=xy+1/x+1/y is Minimum(1,1)

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extreme f(x,y)=xy+1/x+1/y

extreme points

f (x, y) = x y + \frac{1}{x} + \frac{1}{y}

Minimum (1, 1)

Solution steps

Find the critical points:

(1, 1)

\frac{\partial ^{2} f}{\partial x ^{2}} = \frac{2}{y ^{3}}

D (x, y) = \frac{4}{x ^{3} y ^{3}} - 1

Check the sign of at each critical point

Check critical point

(1, 1) :

Minimum

Minimum (1, 1)

f (x, y) = x - y

f (x) = x^{2} + 2 x

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

f (x) = 2 x^{3} + 9 x^{2} + 12 x + 1

f (x) = 3 x^{4} - 4 x^{3}

What is the extreme f(x,y)=xy+1/x+1/y ?
The extreme f(x,y)=xy+1/x+1/y is Minimum(1,1)