Algebra & graphs · Years 9–10

Quadratic Roots Lab

Learning goalConnect the discriminant to where a parabola meets the x-axis.

Live graph

y = x² − 4

Real roots2
Graph of a quadratic function A parabola with its roots, turning point and y-intercept marked.
Discriminant16b² − 4ac
Turning point(0, −4)axis x = 0

Positive discriminant: the curve crosses the x-axis twice.