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.
RSolve[{b[x+1]==b[x]*(1+r)-d,b[0]==s},b[x],x]
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random