# Algebra

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#### MountEvariste

##### Well-known member
Hi Khadeeja . Welcome to MHB.

I can see

$\displaystyle \frac{r-1}{r^2-2r}-\frac{r-2}{r^2-4}+\frac{-2r}{r^2-2r}$

But then also there's $-1$ underneath that I'm not certain how it's connected to this expression.

It's not clear what you're asking as it stands. Could you post the full question/explain what you want to do?

#### Country Boy

##### Well-known member
MHB Math Helper
I will assume that the "-1" MountEvariste is concerned about is from another problem.
(That's one of the many reasons why it is much better to type a problem in rather than post a picture.)

Do you know about "getting a common denominator" in order to add fractions?

Do you know that $r^2- 2r= r(r- 2)$ and that $r^2- 4= (r- 2)(r+ 2)$?

So what is a common denominator for these fractions?