Factor x^4 + 1 over ℝ.

A (x^2 + 1)^2

B (x^2 + √2 x + 1)(x^2 − √2 x + 1)

C (x^2 − 1)(x^2 + 2)

D (x^2 + x + 1)(x^2 − x + 1)

Solution

Correct Answer: Option B

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