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.
rref {{0,0,0,4,0},{0,0,3,3,0},{0,2,2,2,0},{1,1,1,1,0}}
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random