Answer :
We have:
We can also write this as:
=(x2)2 - 12
Using identity: a2 - b2 = (a – b)(a + b)
=(x2 + 1)(x2 – 1)
Again,
Using identity: a2 - b2 = (a – b)(a + b)
=(x2 + 1)(x + 1)(x – 1)
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