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Math Help - how to find an equation given something

  1. #1
    Junior Member
    Joined
    Dec 2009
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    71

    how to find an equation given something

    if i= square root of -1, then -4i (6i ) is...
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  2. #2
    Junior Member
    Joined
    May 2010
    Posts
    43
    Let's review the properties of i:

     <br />
i = sqrt (-1)<br />
    <br />
i^2 = -1<br />
    <br />
i^3 = -i<br />
    <br />
i^4 = 1<br />

    each set of i iterates in this fashion which means
    i^5 = sqrt(-1)
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