anonymous
  • anonymous
Show the Series n=1 to infinity nX^n converges to f(x)=x/(1-x)^2... without the use of taylors theorem
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
take the derivative of \[\frac{1}{1-x}=\Sigma x^n\] to get \[\frac{1}{(1-x)^2}=\Sigma n x^{n-1}\]
anonymous
  • anonymous
then multiply by x to get \[\frac{x}{(1-x)^2}=\Sigma nx^n\]
anonymous
  • anonymous
of course you have to be able to justify taking the derivative term by term, and also note that the radius of convergence is -1 < x < 1

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anonymous
  • anonymous
Thanks Yeah I did the term by term derivative, so is the initial geo series starting at n=1?
anonymous
  • anonymous
the initial series starts at n = 0 not n = 1, but this is not a problem because the final one gives 0 for n = 0 so you might as well start at n = 1

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