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Factorize: x^2 – 1 – 2a – a^2​​​​​​​.

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Factorize: x2 – 1 – 2a – a2.

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x2 – 1 – 2a – a2 

= x2 – (1 + 2a + a2 ) 

= x2 – (a + 1)2 

= (x – (a + 1)(x + (a + 1) 

= (x – a – 1)(x + a + 1)

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