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- 9x²(x +2) + (x + 2) = (x + 2)(1 - 9x²) = (x + 2)(1 - 3x)(1 + 3x)
W(x) = x³ - x² + x - 1
x²(x- 1) + (x - 1) = (x - 1)(x² + 1)
W(x) 3x³ - 6x² + 4x - 8
3x²(x - 2) + 4(x - 2) = (x - 2)(3x² + 4)