6400= 400(x^2+16)+4(x^2+16)(x^2-20x+116)+400(x^2-20x+116)-((x^2+16)^2 + 2 (x^2+16)(x^2-20x+116) + 200(x^2+16) + (x^2-20x+116)^2 + 200(x^2-20x+116) + 10000 )

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.