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.
solve d/df p*log(1 + f*b) + q * log(1 - f) = 0 for f
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random