Mathematics for IGCSE & O level - Equations (Section 6 - No. 25)
In the context of solving quadratic equations, when does 'x² + bx + c = 0' have two solutions?
When the discriminant is negative.
When the discriminant is zero.
When the discriminant is positive.
Always
Giải thích
Quadratic equations have two real solutions if the discriminant (b²-4ac) is greater than zero (positive).