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Math Help - Roots of cubic equations and new equation

  1. #1
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    Roots of cubic equations and new equation

    I've written everything down on this piece of paper and was wondering if it was right. I've taken past advice from people on here into account and I'm slowly getting better at this. Please could you check if my workings are correct?

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  2. #2
    Senior Member Dinkydoe's Avatar
    Joined
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    I ran through it and came to the same answers. I catched no mistakes.
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