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**1. Homework Statement**

Hey, it's me again. This method is giving me some trouble. This is the first problem: [tex]\int^3_0\ x^2\sqrt{9-x^2} \ dx[/tex]

The second problem is:

[tex]\int\frac{dx}{\sqrt{2x^2+2x+5}}[/tex]. How do I use a trig. substitution to start on this one?

**2. Homework Equations**

**3. The Attempt at a Solution**

http://www.mcp-server.com/~lush/shillmud/int2.4a.JPG

I know I need to apply an identity here and then maybe integrate by parts. Also, what's the proper way to transform the limits of integration in this type of substitution? Thank you for your input.