# Math Help - simple differentiation

1. ## simple differentiation

Please help, just can't remember how to do this!

Differentiate 1/(1-x)
(w.r.t.x)

It's for part of a ridiculously hard stats problem, I just can't recall this simple rule!

Thanks

2. Rewrite it as (1 - x)^{-1} and then use the chain rule...

3. Originally Posted by canger
Please help, just can't remember how to do this!

Differentiate 1/(1-x)
(w.r.t.x)

It's for part of a ridiculously hard stats problem, I just can't recall this simple rule!

Thanks
Use Quotient rule

$\displaystyle \frac{ vu' - uv'}{v^2}$ where u = 1 and v =(1-x) you should get

1/(1-x)^2

Ta!