Mathematics for IGCSE & O level - Equations (Section 3 - No. 22)
What does a negative value for the discriminant indicate in a quadratic equation?
Two real roots.
No real roots (complex roots).
The roots are the same.
The graph of the equation does not intersect the x-axis.
解释
A negative discriminant means that there are no real roots, and the corresponding parabola does not intersect the x-axis.