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.
(.2*4^2+.25*3^2+.3*2^2+.1*1^2+.15*0^2)-2.25^2
(.2*4^2+.25*3^2+.3*2^2+.1*1^2+.15*0^2)-2.25^2
Natural Language
Math Input
Extended Keyboard
