Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
plot[{3/x^2-1/x-3/x^3, 0},{x,0,20},{y,-0.25,0.1}]
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random