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If you are at a level that you need to ask this question then the likelihood is that you have made a mistake, since you are not likely to have learned about imaginary (or complex) numbers.
For the quadratic formula, first rewrite the equation as: 3x2 + 0x + 9 = 0
Then
a = 3, b = 0 and c = 9
So x = [0 ± √(02 - 4*3*9)]/(2*3)
= √-108/6 = √-3 = i√3 where i is the imaginary square root of -1.
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