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Math Help - Complex Number System

  1. #1
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    Complex Number System

    So I'm having trouble with imaginary numbers...
    here's the problem

    Evaluate the following square root expression

    √(-8x^9)

    the ^ represents superscript so its x to the 9th power

    this is my process so far

    √(-8x^9)
    = i√(8x^9)
    = 2i√(2x^9)
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  2. #2
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    Quote Originally Posted by jacobdevore View Post
    So I'm having trouble with imaginary numbers...
    here's the problem. Evaluate the following square root expression
    √(-8x^9)
    I fully realize that you have posted in the pre-algebra/algebra forum.
    That said, I have some real concerns with you question.

    Many of us do not like the notation \sqrt{-8x^9} if x is a complex number.

    Now if x is a real number, then there are additional problems.

    For example: if x\le 0 then \sqrt{-8x^9} is a real number.

    If x>0 then \sqrt{-8x^9}=2x^4\sqrt{2x}~i

    All "bets" are off if x is a complex number!
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