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Math Help - Power Series

  1. June 24th 2007, 07:51 PM #1
    qbkr21
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    Power Series

    -qbkr21
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  2. June 24th 2007, 07:57 PM #2
    ThePerfectHacker
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    You use the ratio test improperly,

    \left| \frac{(-1)^{n+1}(x+3)^{n+1}}{(n+1)5^{n+1}} \cdot \frac{n5^n}{(-1)^n(x+3)^n} \right| \to \frac{|x+3|}{5}

    We need that,
    \frac{|x+3|}{5} < 1

    Solve from there thyself.
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