My Math Forum how to treat x d2/dx2

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 June 5th, 2011, 11:48 PM #1 Newbie   Joined: Jun 2011 Posts: 1 Thanks: 0 how to treat x d2/dx2 This question is probably really simple, but I just want to clarify how I should be treating this x: if I have y=ln(1-5x) and I want to find a term for dy/dx - x^2 d2y/dx2... How should I be treating the x^2 wrt finding the term for the derivative? Appreciate any pointers.
 June 6th, 2011, 02:42 AM #2 Math Team   Joined: Sep 2007 Posts: 2,409 Thanks: 6 Re: how to treat x d2/dx2 Since the $x^2$ is outside the derivative just multiply by it after taking the second derivative. You do NOT differentiate the $x^2$.
 June 6th, 2011, 08:13 PM #3 Senior Member   Joined: Apr 2007 Posts: 2,140 Thanks: 0 I got dy/dx - x²d²y/dx² = 5(-1 + 5x²/(1 - 5x))/(1 - 5x).

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# derivative d2/dx2

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