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maths

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x3+6x2+18x+13=0

  • maths -

    unless ±1 or ±13 is a root, you're stuck.
    It's easy to show that -1 is a root. So, you have

    (x+1)(x^2+5x+13)

    Now you gotta solve the quadratic, but that's old hat by now.

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