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

On a separate piece of paper, sketch the graph of the parabola http://math.webwork.rochester.edu:80...cc64c02f01.png. On the same graph, plot the point http://math.webwork.rochester.edu:80...fce7afd941.png. Note that there are two tangent lines of http://math.webwork.rochester.edu:80...cc64c02f01.png that pass through the point http://math.webwork.rochester.edu:80...fce7afd941.png.

Specifically, the tangent line of the parabola http://math.webwork.rochester.edu:80...cc64c02f01.png at the point http://math.webwork.rochester.edu:80...1f2260feb1.png passes through the point http://math.webwork.rochester.edu:80...fce7afd941.png where http://math.webwork.rochester.edu:80...df1041a0f1.png. The other tangent line that passes through the point http://math.webwork.rochester.edu:80...fce7afd941.png occurs at the point http://math.webwork.rochester.edu:80...ed54384d61.png.

Find the number a=

Thanks!