What is the extreme f(x,y)=3+x^2+xy+y^2 ?

The extreme f(x,y)=3+x^2+xy+y^2 is Minimum(0,0)

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extreme f(x,y)=3+x^2+xy+y^2

extreme points

f (x, y) = 3 + x^{2} + x y + y^{2}

Minimum (0, 0)

Solution steps

Find the critical points:

(0, 0)

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

D (x, y) = 3

Check the sign of at each critical point

Check critical point

(0, 0) :

Minimum

Minimum (0, 0)

f (x, y) = x^{2} - 6 x y + 2 y^{2} + 10 x + 2 y - 5

\frac{3}{4} \cdot \frac{2}{5}

f (x) = 6 x + 7 ln (x)

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

f (x, y) = 3 x^{2} - x \cdot y - y - 4 \cdot x - 1

What is the extreme f(x,y)=3+x^2+xy+y^2 ?
The extreme f(x,y)=3+x^2+xy+y^2 is Minimum(0,0)