June 7th, 2010, 07:13 PM  #1 
Newbie Joined: Jun 2010 Posts: 6 Thanks: 0  Direction of max increase
Find the direction of max increase of at point (1,1) I got 12i6j ? Also how do you find the max constraint of f(x,y)=4xy subject to the constraint x^2+ (y+1)^2 = 1 ? Thanks 
June 8th, 2010, 06:45 AM  #2 
Newbie Joined: Jun 2010 Posts: 6 Thanks: 0  Re: Direction of max increase
Am I on the wrong forum?

June 8th, 2010, 08:37 AM  #3  
Global Moderator Joined: Nov 2009 From: Northwest Arkansas Posts: 2,766 Thanks: 4  Re: Direction of max increase Quote:
The max increase result is correct. Have you learned Lagrange multipliers?  
June 8th, 2010, 08:57 AM  #4 
Senior Member Joined: May 2008 From: York, UK Posts: 1,300 Thanks: 0  Re: Direction of max increase if and only if there exists such that Therefore for some iff Differentiate the expression to find its extrema, and then figure out which is the maximum. 

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