Rationalizing quotients I have 
$$\frac{\sqrt{10}}{\sqrt{5} - 2}$$
I have no idea what to do, I know that I can do some tricks with splitting square roots up but pulling out whole numbers like I know that $\sqrt{27}$ is just $\sqrt{3*9}$ so I can pull out a nine which becomes a 3. Here though I have no such options, what can I possibly do?

Hint
$$\frac{1}{\sqrt{5}-2}=\frac{\sqrt{5}+2}{(\sqrt{5}+2)}\frac{1}{(\sqrt{5}-2)} $$
and $(a+b)(a-b)=a^2-b^2$
