# Thread: curious summation operator problem

1. ## curious summation operator problem

Is this correct?

$\Sigma_{i=0}^nx_i(i+1)=\Sigma_{i=0}^nx_ii+\Sigma_{ i=0}^nx_i$

I feel not. I have a long summation expression (this is a simplified model of it) and I am trying to 'open' the brackets in (i+1).

2. Hello, Volga!

$\text{Is this correct?}$

. . $\displaystyle \sum_{i=0}^nx_i\,(i+1)=\sum_{i=0}^n\, x_i i + \sum_{i=0}^nx_i$

Yes, it is!

3. Wow, thanks!