0
That doesn't factor neatly. Applying the quadratic formula, we find two imaginary solutions: 1 plus or minus i times the square root of 3.
x = 1 + 1.7320508075688772i
x = 1 - 1.7320508075688772i
where i is the square root of negative one.
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the factor rainbow of 4 is 1,2,4
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