-a_1^2-a_2^2+8a_1+12a_2=43,a_1^2+a_2^2-8a_1-4a_2=-11

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.