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
説明
Quadratic equations have two real solutions if the discriminant (b²-4ac) is greater than zero (positive).