## Deriving the Formula of the Vertex of Quadratic Functions

In getting the vertex of the quadratic function in general form , we usually need to convert it to the vertex form . In the latter form, the vertex of the parabola is at . For example, the function in the general form

can be rewritten in the vertex form as

.

In the vertex form, it is easy to see that the vertex is at .

Aside from this method, we can also use the ordered pair

in place of . » Read more