I seem to be missing something really easy step or something.

On a separate piece of paper, sketch the graph of the parabola . On the same graph, plot the point . Note that there are two tangent lines of that pass through the point .

Specifically, the tangent line of the parabola at the point passes through the point where . The other tangent line that passes through the point occurs at the point .

Find the number a=

Thanks!