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Using factor theorem, factorize each of the following polynomials : `x^3+2x^2-x-2`

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`x^3+2x^2-x-2`
`= x(x^2 – 1) – 2(x^2 – 1)`
`x^3 – 2x^2 – x + 2 = (x^2 – 1) (x – 2)`
Using the identity:` a^2 − b^2 = (a + b) (a- b)`
`∴ (x^2 – 1) = (x + 1)(x – 1)`
`= (x – 1) (x + 1) (x- 2)`
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