Mathematics for IGCSE & O level - Equations (Section 2 - No. 35)
How should you handle the case when a quadratic equation's discriminant is zero?
Use the quadratic formula with the '±' part.
Set up two different solutions.
The equation does not have real solutions.
Only one real solution, a repeated root.
Forklaring
If the discriminant is zero, the square root of zero is zero, leading to only one real solution.