Learn how to factor 5-term polynomials by grouping.
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Factor x^4-4x^3+2x^2-11x+12
By rational zero theorem: https://youtu.be/yx2RetjV1Bo
By grouping: https://youtu.be/55ufNfFofzY
The double-cross method: https://youtu.be/B8dCd6PkHMY