I find that having the () on the x^{2} can sometimes make the quadratic formula confusing, as having the correct sign on the a,b, and c values is critical to get the correct answer. Multiply the whole equation by 1 and give the quadratic equation another shot!
The discriminant: b^{2 } 4*a*c is also a very helpful tool for solving polynomials.
Hope this helps!
12/15/2013

John L.