I recommend the old-fashioned way: Make a list of a bunch of values for 'x'. Then, for each one, use the equation to find the value of F(x). Each pair of numbers you'll have represents one point on the graph, and it won't take too many of them before you start to see what the whole graph is doing. Here is a list of 'x' values to start with: -6, -5, -4, -3, -2, -1, 0, 1, 2, 4, 5, 10, 20. These will get you going, and may be enough. Notice that 'x' can't be less than -6.
