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Math Help - finding nth term of a binomial

  1. #1
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    finding nth term of a binomial

    find the 4th term of (7+i)^8.
    i got 941,192i^3 for my answer, but i dont know if you simplify the i^3 into i(i^2), and then obtain the answer -941,192i

    which is the correct answer?
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  2. #2
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    i^3=-i
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