On a separate piece of paper, sketch the graph of the parabola $f(x)=x^{2}+4$. On the same set of axes, plot the point $(0, -4 )$. Notice that there are two points on the parabola [of the form $(\pm a, f(a) )$ ] at which the tangent lines to the parabola pass through $(0, -4 )$. Draw these two points and these two lines.

The point with positive $x$-coordinate that is on the parabola and has its tangent line to the parabola passing through $(0, -4 )$ is .