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An equation with degree 3

  1. Oct 28, 2011 #1
    I have an equation similar:
    a, b, c are real number.
    if p, q , t be roots.
    What can say about (p+q-2t) and (p^2+ q^2-2t^2)???
    Please help me??
    Thanks so much.
  2. jcsd
  3. Oct 28, 2011 #2


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    Science Advisor

    hint: write your polynomial as 8(x-p)(x-q)(x-t) and multiply it out, then compare coefficients.
  4. Oct 28, 2011 #3
    I know
    but I need value for
    (p^2+ q^2-2t^2)???
    Please help me??
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