Which of these expressions is equivalent to x^4–16?

(x^2+4)(x–2)(x+2)
(x^2–4)(x^2–4)
(x+2)(x–2)(x+2)(x–2)
(x^2–2)(x^2–2)

I know it is not B or D. But I am not sure if it is A or C.
Please help

3 answers

(x^2+4)(x^2-4)
= (x^2+4)(x-2)(x+2)
Thank you, I figured out the answer was A, thank you for helping so much!(:
Yes, you should have figured it out because it was almost the same as the last one.
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