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A complete factorisation of x4 + 64 is

(x2 + 8)2
(x2 + 8)(x2 - 8)
(x2 - 4x + 8)(x2 -4x - 8)
(x2 + 4x + 8)(x2 - 4x + 8)

Correct Answer: (x2 + 4x + 8)(x2 - 4x + 8)

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