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Best Answer
(X^2) + 4 = 0
(X^2) = -4
X = +/- 2i
(X+2i)(X-2i)
This can't be factorised easily. The above method is the factorisation for (X^2) - 4,
and is also the difference of two squares (9-4) = (3+2)(3-2) etc...
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