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.
[[1,0,0,0],[0,-3,0,3],[3,9,0,-18],[1,0,-1,0]]*[[1,-3,0,3],[-2,-6,0,13],[0,-3,1,3],[-1,-4,0,8]]*[[1,0,0,0],[0,-3,0,3],[3,9,0,-18],[1,0,-1,0]]^-1
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random