These are my top 3 polynomial factoring tricks for math Olympiad competitions. We will factor 3 quartic polynomials by "the double-cross method", "substitution", and "a hidden sum of two cubes with the difference of two squares" If you are a high school student living in the NorCal area, then consider participating in the Berkeley Math Tournament: https://www.ocf.berkeley.edu/~bmt/ for more info.

0:00 The "double cross" method
5:37 by substitution
7:33 Hidden the sum of two cubes and the difference of two squares

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