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Factorize: x^2-1-2a-a^2...

Factorize: `x^2-1-2a-a^2`

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`x^2-1-2a-a^2`
`=>x^2−(1+2a+a^2)`
`=>x^2−(1+a)^2,Since, a^2+2ab+b^2=(a+b)^2`
We know,`a^2−b^2=(a+b)(a−b)`
`=>(x+1+a)(x−1−a)`
`x^2−1−2a−a^2=(x+1+a)(x−1−a)`
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