The best way to graph functions like this is to make a short table & determine corresponding values of x & y
So, x y x y
0 -1 -2 .04
2 -25 -5 -.00032
5 -3125 -10 -.0000001
As you can see the function is alway negative, Grows very large negative (quickly) in the fourth quadrant, crosses y=-1 at x = 0, and then it stays just under the -x axis out to - infinity in the third quarter!
I would also suggest that you download the free program "Graph" at download.com.