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.
inverse [7,1,2],[ -5,0,-1],[ 2,1,3 ]
inverse [7,1,2],[ -5,0,-1],[ 2,1,3 ]
Natural Language
Math Input
Extended Keyboard