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Math Help - complex multiplication

  1. #1
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    Post complex multiplication

    COMPLEX NUMBERS

    ---
    z = (9 - 7i)
    Find the product of z and its complex conjugate
    ---

    Huh?!
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  2. #2
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    Quote Originally Posted by RedSpades View Post
    COMPLEX NUMBERS

    ---
    z = (9 - 7i)
    Find the product of z and its complex conjugate
    ---

    Huh?!
    This is a rule
    Product of,
    a+bi
    With conjugate,
    a-bi
    Is, (by just expanding)
    a^2+b^2
    Thus,
    9^2+7^2
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