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## Homework Statement

Learning to solve cubic equations without the knowledge of any roots, and the easiest way I found out so far is still time-consuming :grumpy:

## Homework Equations

The equation and attempt is shown in the image below, tell me if its unclear :shy:

## The Attempt at a Solution

http://sphotos-a.ak.fbcdn.net/hphotos-ak-prn1/c67.0.403.403/p403x403/60637_450846098287003_1194154338_n.jpg [Broken]

eventually found out x=7. Then by reducing the equation into a quadratic, I can find the other roots

So are there better ways in solving cubic? maybe some hacking fast ones? :D Appreciate the help! :rofl:

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