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