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**[SOLVED] need some help differentiating**

Uh my bad, forgot how to differentiate ln's

## Homework Statement

[tex]\frac{V_0}{xln(\frac{b}{x})} [/tex]

Find dE/dx

I can almost get the answer, but I had to use matlab to find the actual answer, so I am kind of feeling stupid now.

My problem is when I try to differentiate the ln

## Homework Equations

## The Attempt at a Solution

[tex]d/dx(\frac{V_0}{xln(\frac{b}{x})}) = \frac{-V_0}{x^2 ln(b/x)} + \frac{V_0 * b/x^2}{x ln(b/x)^2} =[/tex]

[tex]\frac{-V_0}{x^2 ln(b/x)} + \frac{V_0 * b}{x^3 ln(b/x)^2}[/tex]

The second term should only have x^2 in it (and no b), does anyone see where I went wrong?

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