Writing Quadratic Equations from a Graph, Lecture notes of Algebra

Writing Quadratic Equations from a Graph

To write the equations of a quadratic function when given the graph:

1) Find the vertex (h,k) and one point (x,y)

2) Plug into Vertex Form y = a( x - h)2 + k

3) Solve for a

4) Plug a and (h,k) back into vertex form