Bow Down To This Javascript
Directions: type the coefficient in the white box, and click the grey boxes next to the X with the degree you want. You can have complex ones, too. If it's real, just be nice to yourself and leave the box next to "i" empty.
Free JavaScripts provided
by The JavaScript Source
Note: This doesn't mean you shouldn't know how to do this without it. I just think it's a handy tool!