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.
y^2+4y+4x^2+4x+21
y^2+4y+4x^2+4x+21
Natural Language
Math Input
Extended Keyboard
