Factor out 6x2 plus 17x plus 40?

This doesn't factor neatly. Applying the quadratic equation, we find two imaginary solutions: (-17 plus or minus the square root of -671) divided by 12

x = -1.4166 + 2.158638974498103i
x = -1.4166 - 2.158638974498103i

where i is the square root of negative one.