x4 - x + x2
x4 - x2 + x2
x4 + x2 + 1
x4 + x2
Correct answer is C
(x2 + x + 1)( x2 - x + 1) = x2(x2 + x + 1) - x(x2 + x + 1) + (x3 + x + 1) = x4 - x3 + x2 + x3 - x2 - x + 1 = x4 + x2 + 1
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