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.
lim ((2x+1)^(1/2)-(4x+7)^(1/2))/((x)^(1/2)+(x+5)^(1/2)-5), x->4
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random