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 (x^{15}+x^{16}+x^{17}+x^{18}+x^{19}+x^{20})^2
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random