There's a problem. I presume that your summation is this:
$\displaystyle \sum_{x = 1}^{\infty} (x + 1)$
x here is a dummy variable, which means that you can't pick out an x for this to be true. The sum does not depend on x.
As far as LaTeX is concerned, we have a forum for that. See here.
-Dan
Yah when I look at this question I was really confused. I'm not sure if my teacher wanted me to put in an expression or something. It was written as {(x+1)} superscript infinity subscript 1, but I'm assuming that means the same thing as what I typed in the original post.
Also, thanks for telling me how to type equations. I can't figure out how to type superscript and subscript on top of each other. Sorry
[tex]\sum\limits_{k = 1}^\infty {\left( {x + 1} \right)} [/tex] gives $\displaystyle \sum\limits_{k = 1}^\infty {\left( {x + 1} \right)} $
Click on the “go advanced” tab. On the toolbar you will see $\displaystyle \boxed{\Sigma}$ clicking on that give the LaTeX wraps, [tex] [/tex]. The code goes between them.
This series converges for only one value if x, $\displaystyle x=-1$.
$\displaystyle \sum\limits_{k = 1}^\infty {\left( {x + 1} \right)} $
Could that be what was meant?