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Answer:
x^4 + 4
Adding and subtracting 4x^2, we get
x^4+ 4x^2- 4x^2+ 4
= (x^2 + 2)^2. - (2x)^2
= (x^2 + 2x + 2)(x^2 - 2x + 2)
As a^2 - b^2 = (a+b)(a-b)
so the factors are +2 and -2
Step-by-step explanation:
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