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x^3 -x^2 -10x -8 =x^3 +x^2 -2x^2 -2x -8x -8 =x^2(x+1) -2x(x+1) -8(x+1) =(x+1)(x^2 -2x -8) =(x+1)(x^2 +2x -4x -8) =(x+1){x(x+2) -4(x+2)} =(x+1)(x+2)(x-4)
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