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Math Help - roots of a 3rd degree polynomial.

  1. #1
    jeb
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    roots of a 3rd degree polynomial.

    temp = -0.33362(x) + 0.0102(x^2) - 0.000136589(x^3) - 0.20819
    -0.33362(x) + 0.0102(x^2) - 0.000136589(x^3) - (0.20819 -temp) = 0

    temp is a known number and is between 34.7 and 38.7

    This is equation that I need to solve in terms of x and x is between 0 and 25.

    So which one of the 3 roots of this equation has the real root which is between 0 and 25?

    Please help! This is for a program I'm writing for my summer research. This equation is the main component of the in the math so I really need this.

    Many Thanks in advance.
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  2. #2
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    Quote Originally Posted by jeb View Post
    temp = -0.33362(x) + 0.0102(x^2) - 0.000136589(x^3) - 0.20819
    -0.33362(x) + 0.0102(x^2) - 0.000136589(x^3) - (0.20819 -temp) = 0

    temp is a known number and is between 34.7 and 38.7

    This is equation that I need to solve in terms of x and x is between 0 and 25.

    So which one of the 3 roots of this equation has the real root which is between 0 and 25?

    Please help! This is for a program I'm writing for my summer research. This equation is the main component of the in the math so I really need this.

    Many Thanks in advance.
    no solutions between x = 0 and x = 25 ... see the attached graphs.
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