Thread: finding roots of cubics and quartics

How can I find the roots of these equations. I.E, how can I factor the cubic to get a binomial and a quadratic so then I can use the quad. formula for the last two factors?

TYIA



also

Originally Posted by hello

How can I find the roots of these equations. I.E, how can I factor the cubic to get a binomial and a quadratic so then I can use the quad. formula for the last two factors?

TYIA



also

You can use the rational roots theorem to give a list of candidate rational roots which you then check to see if one or more is an actual root.

The rational root theorem says that any rational root of a polynomial equation is the ratio of a factor of the constant terma and the coeficient of the highest order term.

so for the cubic here the list of candidates is:



CB