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Hello, i read that a sum of exponentiations like [itex]x^0+x^1+x^2+x^3...+x^n[/itex] can be solved with this forumula [itex]\frac{x^(n+1)-1}{x-1}[/itex], how is it possible do demonstrate this resolutive formula?
Thank you!
Thank you!
I didn't understand why you wrote (x-1) after the expansion... thank you