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.
vector (1%2C3%2C-1) %2B (-2%2C1%2C6)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random