x^3 + 2x^2 + x - 4 = x^3 - x^2 + 3x^2 - 3x + 4x - 4 = x^2 ( x - 1 ) + 3x ( x - 1 ) + 4 ( x - 1) = ( x - 1 ) ( x^2 + 3х + 4 )
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x^3 + 2x^2 + x - 4 = x^3 - x^2 + 3x^2 - 3x + 4x - 4 = x^2 ( x - 1 ) + 3x ( x - 1 ) + 4 ( x - 1) = ( x - 1 ) ( x^2 + 3х + 4 )