# Thread: Find the power series

1. ## Find the power series

So I encountered this problem on my final today and had no idea how to do it.

$f \left( x \right) ={\frac {x+1}{x-1}}$

How do I do this?

2. Sorry it may not make sense, I don't remember the whole thing.

3. Try to consider that is...

$\frac{x+1}{x-1}= \frac{x+1-2 +2}{x-1} = 1 - \frac{2}{1-x}$ (1)

Kind regards

$\chi$ $\sigma$