$\"\"$

Observe the graph:

The parabola is vertical, opens down and vertex is $\"\"$ .

Standard form of vertical parabola is $\"\"$ .

Where $\"\"$ is vertex.

$\"\"$ .

If $\"\"$ then the parabola opens to the down and $\"\"$ parabola opens up.

The parabola passes through the point $\"\"$ .

$\"\"$

Find the value of $\"\"$ .

Substitute $\"\"$ in $\"\"$ .

$\"\"$

$\"\"$ .

Substitute $\"\"$ in $\"\"$ .

$\"\"$

$\"\"$ .

$\"\"$

The equation of the parabola is $\"\"$ .