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Question
A complete factorisation of x4 + 64 is?
Options:
A .  (x2 + 8)2
B .  (x2 + 8)(x2 - 8)
C .  (x2 - 4x + 8)(x2 - 4x - 8)
D .  (x2 + 4x + 8)(x2 - 4x + 8)
Answer: Option D

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