Posted by Jo on Thursday, December 20, 2012 at 10:45pm.
Did you mean "solve by completing the square " ?
if so, then first divide by 3
x^2 + (7/3)x = -3
x^2 + (7/3)x + 49/36 = -3 + 49/36
(x+7/6)^2 = -59/36
x+7/6 = ± √59 i /6
x = (-7 ± i√59)/6
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