What is the extreme f(x)=y^3+3x^2y-6x^2-6y^2+2 ?

The extreme f(x)=y^3+3x^2y-6x^2-6y^2+2 is Minimum(0,4),Maximum(0,0),Saddle(2,2),Saddle(-2,2)

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extreme f(x)=y^3+3x^2y-6x^2-6y^2+2

extreme points

f (x) = y^{3} + 3 x^{2} y - 6 x^{2} - 6 y^{2} + 2

Minimum (0, 4), Maximum (0, 0), Saddle (2, 2), Saddle (- 2, 2)

Solution steps

Find the critical points:

(0, 4), (0, 0), (2, 2), (- 2, 2)

\frac{\partial ^{2} f}{\partial x ^{2}} = 6 y - 12

D (x, y) = (6 y - 12)^{2} - 36 x^{2}

Check the sign of at each critical point

Check critical point

(0, 4) :

Minimum

Check critical point

(0, 0) :

Maximum

Check critical point

(2, 2) :

Saddle

Check critical point

(- 2, 2) :

Saddle

Minimum (0, 4), Maximum (0, 0), Saddle (2, 2), Saddle (- 2, 2)

x^{2} + 2 x y + 2 y^{2} + 2 x - 2 y

f (x) = t^{3} - 15 t^{2} + 72 t + 8

f (x) = \frac{7}{12} x^{3} + 7 x^{2} + 21 x + 9

R (x, y) = - 5 x^{2} - 4 y^{2} - 4 x y + 68 x + 72 y

f (x, y) = 9 - x^{2} - 2 y^{2}

What is the extreme f(x)=y^3+3x^2y-6x^2-6y^2+2 ?
The extreme f(x)=y^3+3x^2y-6x^2-6y^2+2 is Minimum(0,4),Maximum(0,0),Saddle(2,2),Saddle(-2,2)