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Math Help - Roots of Cubic

  1. #1
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    Roots of Cubic

    Hi , I don't know what's going on here with the sigma notation (attached question and answer) .
    A simplified explanation would be greatly appreciated .

    Thank you
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  2. #2
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    Re: Roots of Cubic

    There are a many sigmas/ Which one are you referring to?
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  3. #3
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    Re: Roots of Cubic

    Hi , alpha=2 the first one and then why gamma is omitted in the second .
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  4. #4
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    Re: Roots of Cubic

    Quote Originally Posted by minicooper58 View Post
    Hi , I don't know what's going on here with the sigma notation (attached question and answer) .
    A simplified explanation would be greatly appreciated .

    The cubic is z^3-2z^2+0z+k=0

    The sum of the roots; \alpha+\beta+\gamma=2

    The product of roots two at a time: \alpha\beta+\alpha\gamma+\beta\gamma=0

    The products of the roots: \alpha\beta\gamma=-k
    Thanks from minicooper58 and topsquark
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