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.
log((-A+B+sqrt(A^2+B^2+A B (-2+4 e)))/(2 B)) /. A=.8, B=.5
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random