0
Anonymous
x^2 + 1 = 0
x^2 - (-1) = 0
x^2 - i^2 = 0
(x - i)(x + i) = 0
x = i or x = -i
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(x2 - x + 1)(x2 + x + 1)
(x + 1)(2x + 5)
No
(x-5i)(x+5i)
3x2 + 10x + 3 = (x + 3)(3x + 1).