Mathematics for IGCSE & O level - Sketching Curves (Section 3 - No. 27)

For a quadratic function, what does the sign of the coefficient of \(x^2\) tell you?

The y-intercept of the graph

The vertex of the graph

The direction the parabola opens

The slope of the graph

The sign of the coefficient of \(x^2\) determines if the parabola opens upwards (positive) or downwards (negative).