If the vertex (h,k) and one other point (x,y) on the graph of a parabola are known, you can write the equation of the parabola in vertex form.
1. Draw a vertex and point.
• Select and then click in the pad to get your vertex A.
• Click again in the pad to get your point B.
Vertex: (h, k) \quad Point: (x, y)
Now - let's have some fun before calculating .
2. Draw the axis of symmetry through the vertex.
3. Draw the point C on the parabola symmetric to B.
Use the or until you see all three points!
Now - if we calculate correctly - our parabola will go through these three points A, B and C.
If the parabola goes through A, B and C then your answer is correct!
Problems? Thinking 1... & Thinking 2...