# Careful

Algebra Level 3

Source of picture

Which of the following is the expanded form of $$x^4 + 4$$ ?

1.) $$(x^2 + 2x + 2)(x^2 - 2x + 2)$$

2.) $$(x-2)(x+2)(x^2 + 2)$$

3.) $$(x^2 - 2)(x^2 +2)$$

4.) None of the choices.

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