T Thylacine New Member Joined May 1, 2012 Messages 18 Gender Undisclosed HSC N/A Mar 7, 2013 #1 Having problems with this one. Find the point of inflexion on the curve y = x loge x-x2 Can anyone help?
Having problems with this one. Find the point of inflexion on the curve y = x loge x-x2 Can anyone help?
D Drongoski Well-Known Member Joined Feb 22, 2009 Messages 4,255 Gender Male HSC N/A Mar 7, 2013 #2 Pt of inflexion: Last edited: Mar 10, 2013
F funnytomato Active Member Joined Jan 21, 2011 Messages 847 Gender Male HSC 2010 Mar 7, 2013 #3 y=xlnx-x^2 y'=lnx+1-2x y''=1/x-2 =0 at pt of inf, so x=1/2 and sub into y , what you get should be the same as Drongoski's answer of course you should verify the change of concavity
y=xlnx-x^2 y'=lnx+1-2x y''=1/x-2 =0 at pt of inf, so x=1/2 and sub into y , what you get should be the same as Drongoski's answer of course you should verify the change of concavity
T Thylacine New Member Joined May 1, 2012 Messages 18 Gender Undisclosed HSC N/A Mar 7, 2013 #4 Thankyou both for your help. I realise now I was treating the x - x^2 as though it was in brackets. ie loge(x-x^2). This caused major problems when trying to find the second derivative. Thanks again.
Thankyou both for your help. I realise now I was treating the x - x^2 as though it was in brackets. ie loge(x-x^2). This caused major problems when trying to find the second derivative. Thanks again.