The function is .

Write the function in vertex form.

                           (Original function)

           (Subtract from each side)

      (Group and factor, dividing by )

                   (Complete the square)

                   (Write as a vertex form)

Find the vertex, axis symmetry and direction of opening.

The vertex form of a parabola is  .

Where is the vertex, is the axis of symmetry and determines the shape of the parabola and the direction in which it opens.

So, the vertex is .

The equation of axis of symmetry is .

The value of is negative, so the parabola opens down.

Graph:

Graph the function .

Axis of symmetry is , the parabola opens down.

Graph the function .