# Improper integral

1. May 16, 2017

### yecko

1. The problem statement, all variables and given/known data

https://holland.pk/uptow/i4/7d4e50778928226bfdc0e51fb64facfb.jpg

2. Relevant equations
improper integral

3. The attempt at a solution
(attached)
Whats wrong with my calculation?
I cannot figure it out after hours...
Thank you very much!

2. May 16, 2017

### Eclair_de_XII

In the substitution, it's actually $\frac{du}{dx}=\frac{1}{2\sqrt{x}}$.

3. May 17, 2017

### yecko

oh yes. thank you