Line integral-how to do this question?

[damndamnboi]

http://img243.imageshack.us/my.php?image=80830952sk3.jpg

i did part 1 but the integral was very complicated after i subed in y=x^1/2. Can anyone help in evalutaing the first part. thankyou.

 

[mda]

try using x=y^2 instead