((-1,-1,-1),(0,1,0),(1,0,0))*((1,0,0),(0,2,1/4),(0,0,2))*((0,0,1),(0,1,0),(-1,-1,-1))

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.