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you need to check the discriminant - know what that is ?

no

are you familiar with the quadratic equation ?

use quadratic formula

no not at all.

ever seen this formula ?
\[x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}\]

http://en.wikipedia.org/wiki/Quadratic_equation

\[(-b \pm \sqrt{b^{2}-4ac})/2a\]