if the discriminant is 0 if the discriminant is negative if the discriminant is positive if the discriminant is 0 how many solutions if the discriminant is a perfect square if the discriminant is greater than 0 if the discriminant is greater than zero if the discriminant is zero if the discriminant is 0 how many roots if the discriminant is 4 how many solutions what does it mean if the discriminant is 0 what if the discriminant is negative if the discriminant is less than 0 what happens if the discriminant is 0 what happens if the discriminant is negative how to know if the discriminant is positive what if the discriminant is 0