I need to find the solution to the geometric series expansion of the form...(adsbygoogle = window.adsbygoogle || []).push({});

[itex]\sum[/itex]n^2*x^n , for n=0,1,2,...

most resources I've found only have answers for n*x^n or n*x^(n-1). I have no idea how to calculate this, so I was wondering if there's a book out there that has massive lists of geometric series or is there method for easily calculating this?

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# Geometric Series Expansion

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