A quadratic equation can be solved using the discriminant. The roots of the quadratic equation: $$x_{1} = \frac{\sqrt{D} - b}{2 a}$$ $$x_{2} = \frac{- \sqrt{D} - b}{2 a}$$ where D = b^2 - 4*a*c - it is the discriminant. Because $$a = 5$$ $$b = -12$$ $$c = 0$$ , then