unreachable point

**jacob93** · September 12th 2012, 06:40 AM

Problem: f(x,y) is given by this. find the extreme points.

Attempt: https://dl.dropbox.com/u/586465/Phot...%2037%2004.jpg

The this is: According to the book, (0.5 ; 1) is also a point. But I can't see how.

**MaxJasper** · September 12th 2012, 08:58 AM

Originally Posted by jacob93

Problem: f(x,y) is given by this. find the extreme points.
Attempt: https://dl.dropbox.com/u/586465/Phot...%2037%2004.jpg
The this is: According to the book, (0.5 ; 1) is also a point. But I can't see how.

$\frac{\partial f(x,y)}{\partial x} = 8 x-8 y+4 y^2$

$\frac{\partial f(x,y)}{\partial y} = -8 x+8 x y$

**jacob93** · September 13th 2012, 12:58 AM

thanks

Thread: unreachable point