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Although there is a method for cubics, there are no simple analytical ways.

Sometimes you may be able to use the remainder theorem to find one solutions. THen you can divide the original equation using that solution so that you are now searching for an equation of a lower order. If you started off with a cubic you will now have a quadratic and, if all else fails, you can use the quadratic formula.

You could use a graphic method. A cubic musthave a solution although that solution need not be rational. A quartic need no have any.

Lastly, you could use a numeric method, such as the Newton-Raphson iteration.

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Q: How do you find solutions for cubic and quartic equations?
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