What is the extreme f(x,y)=8x^2-xy+17x-17y-18 ?

The extreme f(x,y)=8x^2-xy+17x-17y-18 is Saddle(-17,-255)

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extreme f(x,y)=8x^2-xy+17x-17y-18

extreme points

f (x, y) = 8 x^{2} - x y + 17 x - 17 y - 18

Saddle (- 17, - 255)

Solution steps

Find the critical points:

(- 17, - 255)

\frac{\partial ^{2} f}{\partial x ^{2}} = 0

D (x, y) = - 1

Check the sign of at each critical point

Check critical point

(- 17, - 255) :

Saddle

Saddle (- 17, - 255)

- x^{2} - y^{2} + x + 2 y - 1

(x - 1) ln (x - 1)

lo g_{10} (1 - x^{2})

x^{3} + y^{3} - 4 x y + 1

x^{\frac{1}{3}} (1 - x)

What is the extreme f(x,y)=8x^2-xy+17x-17y-18 ?
The extreme f(x,y)=8x^2-xy+17x-17y-18 is Saddle(-17,-255)