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>> No.15401228 [View]
File: 23 KB, 990x347, interval.png [View same] [iqdb] [saucenao] [google]
15401228

Can someone explain what exactly is going on
I know to get the radius of convergence you set x in between -1 and 1 and then simplify which changes the one and the negative one in this case they multiply by nine. But what exactly is happening to the 9^(n+1) one for example.
Is the n+1 just ignored?

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