What function correspond to this series expansion?

QMrocks
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Anyone knows what function correspond to this series expansion?

<br /> \begin{align}<br /> f(x)=1+x+x^2+x^3+...<br /> \end{align}<br />
 
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Look up geometric series
 

Thread 'Finding the nth roots of a complex number'

There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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