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.
x'%3D%7B%7B4%2C-2%7D%2C%7B1%2C6%7D%7D.x
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random