$\displaystyle \frac{3}{\sqrt{2t +1}}$

Can someone please explain how I do this. The square root on the bottom has really thrown me out. I can do them when there's no square root but because it's there I'm really not sure.

I was thinking,

$\displaystyle \frac{3}{2}$ $\displaystyle (2t+1)^{1/2}$

but yeah I'm not really sure.

Thanks!