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Math Help - complex number

  1. #1
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    complex number

    hey guys! just a quick how to find inverse 1/z? for the complex number
    (-3-4i)

    i know its very easy, but its really late and my brain has givven up on me. sorry

    please help

    thank you
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  2. #2
    MHF Contributor Mathstud28's Avatar
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    Quote Originally Posted by boomshine57th View Post
    hey guys! just a quick how to find inverse 1/z? for the complex number
    (-3-4i)

    i know its very easy, but its really late and my brain has givven up on me. sorry

    please help

    thank you
    Multiply by the conjugate -3+4i
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  3. #3
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    the conjugate is -3+4i

    so do i multiply (-3+4i)(-3-4i)

    is that what u meant?

    sorry if i sounds very stupid

    thank you for helping me
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  4. #4
    MHF Contributor Mathstud28's Avatar
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    Pennsylvania
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    Quote Originally Posted by boomshine57th View Post
    the conjugate is -3+4i

    so do i multiply (-3+4i)(-3-4i)

    is that what u meant?

    sorry if i sounds very stupid

    thank you for helping me
    \frac{1}{-3-4i}\cdot\frac{-3+4i}{-3+4i}
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