What is the extreme f(x,y)=7-x^4+2x^2-y^2 ?

The extreme f(x,y)=7-x^4+2x^2-y^2 is Saddle(0,0),Maximum(-1,0),Maximum(1,0)

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extreme f(x,y)=7-x^4+2x^2-y^2

extreme points

f (x, y) = 7 - x^{4} + 2 x^{2} - y^{2}

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

Solution steps

Find the critical points:

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

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

D (x, y) = - 2 (- 12 x^{2} + 4)

Check the sign of at each critical point

Check critical point

(0, 0) :

Saddle

Check critical point

(- 1, 0) :

Maximum

Check critical point

(1, 0) :

Maximum

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

\frac{( 12 x ^{3} )}{3} + 38 x^{2} + 56 x, - 8 \leq x \leq 1

- x^{3} + 27 x - 58

y = x^{3} + 2 x

f (x) = 2 x^{3} - 42 x^{2} + 270 x + 10

y = 6 x^{3} + 72 x^{2} + 270 x

What is the extreme f(x,y)=7-x^4+2x^2-y^2 ?
The extreme f(x,y)=7-x^4+2x^2-y^2 is Saddle(0,0),Maximum(-1,0),Maximum(1,0)