How to use it
- Identify h and k carefully from the signs.
- Use a to determine whether the parabola opens up or down.
- Plug in x=h to confirm y=k.
See it in action
y=2(x−3)²−5 has vertex (3,−5).
How to verify it
At x=3, y=−5.
Read a Quadratic in Vertex Form
In y=a(x−h)²+k, the vertex is (h,k) and a controls opening and vertical scale.