musademirtas

hey guys, i am really confused on something.here is the thing: i have; i=x+(x^2-y)^(1/2) and here x is uniform distribution on (a,b) y is uniform distribution on (c,d) x and y independent and there is no information about a,b,c,d.but if you need you can assume anything like a>c. i need to find the probability density function of i but how?????? actually i dont know how to start!!