I have a problem here.

http://img80.imageshack.us/img80/9990/rootio6.jpg

http://img80.imageshack.us/img80/rootio6.jpg/1/w345.png

This is a homework were I have to solve the roots and order them from greatest to least. But specifically, my problem is with the roots greater than square. I have no idea how to solve them. I know how to solve square roots, but roots greater than square seem to have different way of solving, and I can't solve them. No idea. Can anyone please help me with these?