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.
17^2 - x^2 - (21^2 - (10+x)^2) if x = 13/5
17^2 - x^2 - (21^2 - (10+x)^2) if x = 13/5
Natural Language
Math Input
Extended Keyboard
