9709 · 1.1 Quadratics · Session 1

Vertex Form Explorer

Drag the vertex on the graph, or use the sliders. Predict before you reveal. Work out the roots or the expanded form in your head first, then tick the box to check yourself.

Drag the cyan dot to move the vertex. Values snap to the nearest half-unit.

Vertex form

Revealpredict first

Vertex Expanded form Discriminant Δ = b² − 4ac Roots (exact)

Keep a curve to compare the next one against it.

Roots are shown in exact form, 3 ± √2 rather than 1.59 and 4.41. Cambridge marks the exact answer; a decimal loses the mark.