Hey guys, I got two problems here, that are probably extremely basic; but i'm having a hard time with these. When I finally find a $\displaystyle u$-substitution path I can generally work my way through, but I'm hitting a block on these, even just a pointer or what $\displaystyle u$ should be would be great!

1) $\displaystyle \int x^2 \sqrt{x+1}dx$

For this one, I'm trying to find a $\displaystyle u$ sub but I can't seem to make it work, I keep wishing real hard that the $\displaystyle x^2$ was under the radical and the $\displaystyle x$ was outside.

2) $\displaystyle \int\sin^2{(3x)}dx$

$\displaystyle = \int(\sin{(3x)})^2dx$

Again, no idea what to set $\displaystyle u$ equal to because there is no $\displaystyle 2(\sin{(3x)})(\cos{(3x)})(3)$ with the $\displaystyle dx$

Any toss as to where to go next would be great, thanks for taking a look!