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.
expand 2(x^2 + y^2 + 4) - 1/2(xy - 4)^2
expand 2(x^2 + y^2 + 4) - 1/2(xy - 4)^2
Natural Language
Math Input
Extended Keyboard