Help evaluating these integrals

1. Sep 5, 2004

Ed Quanta

Sorry I dont know how to use the notation, but help me solve the following through the u substitution.

1) dx/square root of x^2+5x

2)dx/x^2*square root of 1-x^2

I am embarassed that I am not able to solve these still after devoting much thought, but help from anyone will be appreciated.

2. Sep 6, 2004

Tide

(1) Complete the square

(2) Let u = 1/x