Mathematics

Factorize:

x4 - 81

Factorisation

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Answer

Given,

⇒ x4 - 81

⇒ (x2)2 - (9)2

⇒ (x2 + 9)(x2 - 9)

⇒ (x2 + 9)[x2 - (3)2]

⇒ (x2 + 9)(x + 3)(x - 3).

Hence, x4 - 81 = (x2 + 9)(x + 3)(x - 3).

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