f(x) = (2+x)/(1-x)
I got it to....
2 sigma x^n + sigma x^(n+1)
sigma goes from 0 to infinity
I'm looking at the solution and they get...
2 + Sigma 2(x^n) + Sigma x^n = 2 + (3)Sigma x^n
In this part Sigma goes from n=1 to infinity
Can someone explain how they got to this step?
P.S. I am so sorry about not putting into the correct type format.