What is the extreme f(x)=4xy-x^4-2y^2 ?

The extreme f(x)=4xy-x^4-2y^2 is Saddle(0,0),Maximum(-1,-1),Maximum(1,1)

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extreme f(x)=4xy-x^4-2y^2

extreme points

f (x) = 4 x y - x^{4} - 2 y^{2}

Saddle (0, 0), Maximum (- 1, - 1), Maximum (1, 1)

Solution steps

Find the critical points:

(0, 0), (- 1, - 1), (1, 1)

\frac{\partial ^{2} f}{\partial x ^{2}} = - 4

D (x, y) = 48 x^{2} - 16

Check the sign of at each critical point

Check critical point

(0, 0) :

Saddle

Check critical point

(- 1, - 1) :

Maximum

Check critical point

(1, 1) :

Maximum

Saddle (0, 0), Maximum (- 1, - 1), Maximum (1, 1)

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

f (x) = f (x) = x x^{2} + 4

f (x) = 2 x^{3} + 3 x^{2} - 120 x + 9

f (x) = x^{3} + 12 x^{2} - 27 x + 6, - 10 \leq x \leq 0

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

What is the extreme f(x)=4xy-x^4-2y^2 ?
The extreme f(x)=4xy-x^4-2y^2 is Saddle(0,0),Maximum(-1,-1),Maximum(1,1)