Mathematics for IGCSE & O level - Sketching Curves (Section 1 - No. 39)
If the coefficient of x² in a quadratic equation is negative, what does that indicate about the graph?
The graph opens upwards.
The graph has a minimum point.
The graph opens downwards.
The graph is a straight line.
Giải thích
A negative coefficient of x² means the parabola opens downward.