Have been explained that the emergency resolution determining the set of quadratic equations by quadratic formula , obtained form :b²-4ac known as the discriminant equation with an identification kuadrat.dan D value (discriminant) it can be concluded the types of quadratic equation roots (HP) it. Following :

1. If D > 0 (positive) then the form √D has a double value as follows : and -

so that the roots: and

So, roots real numbers (real) and different (different)2. If D = 0 (positive) then the form has a value 0 so that:

The roots :

So, roots real numbers (real) and same (twins)3. If D < 0 (negative) then the form has a value not real (imaginer) so that:

nothing real.So, the roots imaginary numbers/imaginer.