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.
(det { {1,2,-2,-1} ,{2,-2,-2,-3}, {2,-2,-1,-5},{3,-1,1,-m}} ) != 0
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random