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 (a−b)(99−c)(999−2c)+(b−c)(99−a)(999−2a)+(c−a)(99−b)(999−2b)+2 (a−b)(b−c)(c−a)
expand (a−b)(99−c)(999−2c)+(b−c)(99−a)(999−2a)+(c−a)(99−b)(999−2b)+2 (a−b)(b−c)(c−a)
Natural Language
Math Input
Extended Keyboard
