# unreachable point

• September 12th 2012, 06:40 AM
jacob93
unreachable point
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.
• September 12th 2012, 08:58 AM
MaxJasper
Re: unreachable point
Quote:

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.

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

$\frac{\partial f(x,y)}{\partial y} = -8 x+8 x y$
• September 13th 2012, 12:58 AM
jacob93
Re: unreachable point
thanks