# Thread: Polynomia Equations of order 3

1. ## 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.

3. ## Re: Polynomia Equations of order 3

$\displaystyle x^3-6x^2+11x-6=0$

4. ## Re: Polynomia Equations of order 3

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

Do you want to solve this equation?

5. ## 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

6. ## Re: Polynomia Equations of order 3

x=2,x=3,x=1 are the solutions

7. ## Re: Polynomia Equations of order 3

Originally Posted by MathBond
Here is very useful site.
Be sure to click the 'show steps' button.

8. ## Re: Polynomia Equations of order 3

Originally Posted by MathBond
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.

9. ## Re: Polynomia Equations of order 3

Originally Posted by Plato
Here is very useful site.
Be sure to click the 'show steps' button.
Thanks.

10. ## 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"