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Math Help - May I have a question?

  1. #1
    Member
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    London
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    May I have a question?

    Hi Masters,

    I calculated 0.2 = e^(-x(ln2/700)) to find x.
    But, I could not use a calculator also did not have any approximation for the value of ln.
    So, I got x = 700(ln5 / ln2).

    But the wolfram says the answer is x = 700((ln5+ 2i pi n) / ln2).
    Can I ask where 2i pi n came from?
    Was I wrong?

    Thanks a lot.
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  2. #2
    MHF Contributor
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    Nov 2013
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    Re: May I have a question?

    Mathematica assumes numbers are complex until you tell it they are real. The complex Log function is periodic w/period 2pi
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