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How can I quickly factorize an equation without using Ruffini's rule or polynomial division?

Take this equation as an example:

x^4-9x^2+20x=0
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migrated from mathematica.stackexchange.com Oct 28 '13 at 19:08

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possible duplicate of Factoring polynomials to factors involving complex coefficients –  Artes Oct 28 '13 at 18:21
    
Make the substitution $x^2=\eta$, then you have a quadratic. –  Hakim Apr 1 at 21:19

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