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Math Help - Polynomia Equations of order 3

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    Post Polynomia Equations of order 3

    I tried solving a polynomial equation using Microsoft math 3.0. The program used a formula involving Trig, a form of cosine formula. I was wondering if anyone could do me the favor of writing me the formula and explain it. Thanks.
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    Re: Polynomia Equations of order 3

    No, your question is too vague. Exactly what is your polynomial equation to start with?
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    Re: Polynomia Equations of order 3

    x^3-6x^2+11x-6=0
    Last edited by MathBond; August 6th 2011 at 05:12 AM. Reason: Corrected the latex tags.
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    Re: Polynomia Equations of order 3

    Quote Originally Posted by MathBond View Post
    x^3-6*x^2+11*x-6=0
    You have to use [ tex ] ... [ / tex], not [ math] ... [ /math]

    Do you want to solve this equation?
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    Re: Polynomia Equations of order 3

    Oh, thanks Siron. I've solved it, can solve it but what I wanna know is if there is a formula that can solve them just like the quadratic formula. Is there a polynomial formula like the one used at Online Equation Solver
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    Re: Polynomia Equations of order 3

    x=2,x=3,x=1 are the solutions
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    Re: Polynomia Equations of order 3

    Quote Originally Posted by MathBond View Post
    Here is very useful site.
    Be sure to click the 'show steps' button.
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    Re: Polynomia Equations of order 3

    Quote Originally Posted by MathBond View Post
    Oh, thanks Siron. I've solved it, can solve it but what I wanna know is if there is a formula that can solve them just like the quadratic formula. Is there a polynomial formula like the one used at Online Equation Solver
    If you've solved it, you definetly know some methods to solve cubic equations, but I don't think there's like one formule to solve all the cubic equations. Maybe you should take a look at Cardano's formula, but I wouldn't recommend that formula in all cases.
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    Re: Polynomia Equations of order 3

    Quote Originally Posted by Plato View Post
    Here is very useful site.
    Be sure to click the 'show steps' button.
    Thanks.
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    Re: Polynomia Equations of order 3

    You may find this web page informative:

    Cubic function - Wikipedia, the free encyclopedia

    See the section titled "Trigonometric (and hyperbolic) method"
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