Find the derivative of the function.

I was watching a video on how to seperate them and they used 0. Can I do that with these two functions?

What I am talking about is breaking the original equation down to...

Or is that completely wrong?

Wow so I suck at making integrals...but the first one is 5x on the bottom and 0 on top. the second is 0 on bottom and 6x on top....sorry