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2(x + 2)
4(x + 2)(x + 2)
(x + 2)(x^2+4)
(x^2 + 9)(x^2 + 5)
2(x + 4)(x + 2)
4(x + 2)(x + 1)
(x+2)(x+2) or (x+2)^2
(x - 2)(x - 4)
(x + 4)(x - 2)(x - 2) or (x + 4)(x - 2)2
(x^2 + 4)(x^4 - 4x^2 + 16)
2(x+4)
2(x^2 + 2)
It is: (x-4)(x+9)