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Math Help - imaginary numbers

  1. #1
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    imaginary numbers

    need to solve 6-6i/-9i

    came up with the answer 2/3 + 2/3i

    What am I doing wrong. It's showing up as incorrect.

    Thank you.
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  2. #2
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    Re: imaginary numbers

    You're missing a negative sign

    \frac{6-6i}{-9i}=\frac{2-2i}{-3i}=\frac{2-2i}{-3i}\cdot \frac{i}{i}=\frac{2i-2i^2}{-3i^2}=\frac{2i+2}{3}

    EDIT: My bad I read the question wrong. I have edited my answer accordingly.
    Last edited by Gusbob; March 23rd 2013 at 06:40 AM.
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  3. #3
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    Re: imaginary numbers

    Hello, needhelpnow!

    Simplify: \frac{6-6i}{-9i}

    Came up with the answer 2/3 + 2/3i

    What am I doing wrong? It's showing up as incorrect.

    Your answer, \tfrac{2}{3} + \tfrac{2}{3}i, is correct.

    If you entered your answer as 2/3 + 2/3i,
    . . it might be read as: \tfrac{2}{3} + \tfrac{2}{3i}


    Try entering it as. 2/3 + 2i/3. or .2/3 + (2/3)i.
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