Factoring in pairs ( or by grouping )

When do you use factoring by grouping? You use it when you have four terms.
0:33 Factor by grouping 3x^3y^2-1xy + 8x^2y-40
Remember when factoring always take the lowest exponent
2:25 Example 2 of factoring by grouping
x^4-3x^3+4x-12

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