you need to graph the problem and then determine for what values of 'x' 'y is equal to zero', so zoom in on the graph and determine where the graph crosses the x-axis (y=0 whenever the graph touches the x-axis)

the graphical form of this equation is:

y = (x-13/40) - 49/1600

one of the solutions will be x=1/2, the other will be 3/20