To plot this graph, create a grid with an x and y axis. Plot 0, 2 by marking the point two units above the intersection of the x and y axes, and plot 1, 4 by marking the point one unit to the right of the y axis and four units above the x-axis.
You multiply by the conjugate to both the denominator and numerator. After that you can simplify by canceling the 4 and then you are able to simplify the (h) as well.