Please note that you have to solve the subsequent equation:
3 x^2 + 12 x + 15 =0
so I factor out 3 from the left side, and I get:
x^2 + 4x + 15 =0
the I apply the standard formula in order to get the roots of that equation:
x = -2 +/- sqrt(4 - 5),
x = -2 +/- i
where, as usual, i is such that i^2 = -1
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