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Factorize: x^3+x-3x^2-3...

Factorize: `x^3+x-3x^2-3`

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`x^3+x-3x^2-3`
`=x^3–3x^2+x-3`
`=x^2(x–3)+1(x–3)`
`=(x–3)(x^2+1)`
`therefore x^3+x–3x^2–3=(x-3)(x^2+1)`
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