How do I factor a trinomial with x^3?

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SUMMARY

The discussion focuses on factoring the cubic trinomial X^3 - 4X^2 + 5. It emphasizes that factoring a cubic polynomial is equivalent to finding its roots. The Rational Root Theorem is highlighted as a method to identify potential rational roots, which can simplify the polynomial to a quadratic form, making it easier to factor. The user is encouraged to inspect for rational roots to facilitate the factoring process.

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jacksonbobby5
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I need help trying to factor a trinomial. It has been a while, and I can't remember how to factor a trinomial with x^3. Please help.

Sample problem...

X^3 - 4X^2 + 5

Thanks
 
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Since factoring is the same problem as finding the roots, such a cubic can always be factored using tedious methods for solving for the roots.

If you can find any root by inspection you can reduce it to a quadratic and you are home free. So I would look for rational roots which in this case will quickly find one. See

http://en.wikipedia.org/wiki/Rational_root_theorem
 

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