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I am trying to find the real coefficients of the given roots. Did I do this right?


answer x^4-71x^2+114x+216=0

  • Algebra -

    Hmm.. I never done this before but I think you are right for the most part. You made a mistake on (x-3)(x+9)(x^2-6x-8) = 0. (x-3)^2 - 2i^2 does not expand to x^2-6x-8.

    x-3)^2 - 2i^2
    x^2 - 6x + 9 + 2
    x^2 - 6x + 11

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