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Math Help - Square rooting a negative number

  1. #1
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    Square rooting a negative number

    Is this right????
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  2. #2
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    Re: Square rooting a negative number

    Quote Originally Posted by asilvester635 View Post
    Is this right????
    You posted this in the Pre-University Algebra Forum.
    That makes it difficult to know what level of mathematics you are doing.

    In simple algebra, if y is a real number then y^2\ge 0.
    Thus \sqrt{-3} does not exist.

    But if you are doing advanced algebra and know that there is a complex number i such that i^2=-1 then if y^2=-3 we have y=\pm\sqrt3~i.
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