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Math Help - find power series

  1. #1
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    find power series

    f(x) = ln(5-x)

    not sure how to find the power series and the radius of convergence.

    please help.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by rcmango View Post
    f(x) = ln(5-x)

    not sure how to find the power series and the radius of convergence.

    please help.
    Hint: \ln (1 - x) = - \sum_{n = 1}^\infty \frac {x^n}n for |x| \le 1,~x \ne 1
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