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Math Help - Another question about complex number in polar form

  1. #1
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    Another question about complex number in polar form

    At last reply:
    http://www.mathhelpforum.com/math-he...-new-post.html

    Deveno given an example like what (a+ai)(a-ai)=0


    Here another complex number discussion recently:
    http://www.mathhelpforum.com/math-he...rm-184791.html

    If rewrite two complex numbers to polar form and multiple with other one. I get a difference result: 2a^2 (i.e. real part only)

    What I'm missing?
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  2. #2
    MHF Contributor Siron's Avatar
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    Re: Another question about complex number in polar form

    What you wright is true. I don't see any mistake:
    (a-ai)(a+ai)=(a)^2-(ai)^2=a^2-(a^2i^2)=a^2+a^2=2a^2

    Take an example:
    (3-4i)(3+4i)=9-(4i)^2=9-(-16)=25

    I don't see any problem ...
    Last edited by Siron; July 22nd 2011 at 03:05 AM.
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  3. #3
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    Re: Another question about complex number in polar form

    Thank you for reply,

    I just found myself confused with Hypercomplex number what Deveno mentioned.
    Sorry for raising brainless question.
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