$\displaystyle \sum^n _{k=1} \pi^k-3 =[\pi^n-1][\pi-1]^{-1}-3n$ correct?
The back of my book is saying: $\displaystyle \sum^n _{k=1} \pi^k-3 =\pi[\pi^n-1][\pi-1]^{-1}-3n$ however, I am not really seeing where the pi is coming from. Suggestions?
$\displaystyle \sum^n _{k=1} \pi^k-3 =[\pi^n-1][\pi-1]^{-1}-3n$ correct?
The back of my book is saying: $\displaystyle \sum^n _{k=1} \pi^k-3 =\pi[\pi^n-1][\pi-1]^{-1}-3n$ however, I am not really seeing where the pi is coming from. Suggestions?