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Question

Factors of a4+a2+1 are

A
(a4)(a+2)
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B
(a2+21)(a2+a+2)
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C
(a2+a+1)(a2a+1)
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D
(a1)(a2a+1)
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Solution

The correct option is C (a2+a+1)(a2a+1)
a4+a2+1=(a2+2a2+1)a2
=(a2+1)2(a)2
=(a2+a+1)(a2a+1)

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