The parabola is .

Take  terms on one side and  terms on other side.

Rewrite the expression.

.

Compare the above equation with .

 and .

Here  is negative then the parabola opens towards left.

The vertex of the parabola is .

The focus of the parabola is 

The directrix of the parabola is .

Graph:

Graph the parabola .

The vertex of the parabola is .

The focus of the parabola is 

The directrix of the parabola is .