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Math Help - easy and quick one

  1. #1
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    easy and quick one

    Erasing x^2 in a cubic equation.
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  2. #2
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    Try to find a such that, if you replace x by y-a and expand, the coefficient in front of y^2 is zero.
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  3. #3
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    Quote Originally Posted by ardam View Post
    Erasing x^2 in a cubic equation.
    If you have x^3 + ax^2+bx+c = 0 let y = x + \frac{a}{3}.
    That should remove the x^2 term.
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  4. #4
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    cheers for the help
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