\(4x^4+4x^3-x^2-x\)
\(=4x^3.\left(x+1\right)-x.\left(x+1\right)=\left(4x^3-x\right).\left(x+1\right)\)
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\(4x^4+4x^3-x^2-x\)
\(=4x^3.\left(x+1\right)-x.\left(x+1\right)=\left(4x^3-x\right).\left(x+1\right)\)
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