Homework Help: Integrate 1/sqrt(x-1)

1. Aug 10, 2010

eddysd

Trying to do an improper integral but for some reason am flummoxed by the integration of 1/sqrt(x-1).

2. Aug 10, 2010

╔(σ_σ)╝

Have you tried the substitution $$u^{2} = x-1$$?

3. Aug 10, 2010

eddysd

nope, thank-you!

4. Aug 10, 2010

Char. Limit

Why that substitution, I wonder? It seems to me that the substitution u=x+1 would be simpler... but I'm sure that, if I tried yours, it would work out just as easy.

Wait, I did. And it was quite easy. Thanks for the alternative substitution route, I actually like this one better.

5. Aug 10, 2010

Staff: Mentor

Probably a typo, but u = x - 1 is a better choice than u = x + 1.

6. Aug 10, 2010

Char. Limit

Indeed. u=x-1 is what I meant.