Ta có: \(2x^3-x^2+5x+3\)
\(=2x^3+x^2-2x^2-x+6x+3\)
\(=x^2\left(2x+1\right)-x\left(2x+1\right)+3\left(2x+1\right)\)
\(=\left(2x+1\right)\left(x^2-x+3\right)\)
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`2x^3-x^2+5x+3`
`=2x^3-2x^2+6x+x^2-x+3`
`=2x(x^2-x+3)+(x^2-x+3)`
`=(2x+1)(x^2-x+3)`
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