How do you get a cube, fourth, fifth root in latex?

[ehrenfest]

[SOLVED] latex question

How do you get a cube, fourth, fifth root in latex? I mean how do you get a little 3 to appear in the upper left next to the square root sign?

 

[robphy]

$$\sqrt[3]{x}$$

 

[ehrenfest]

BTW, what is the best online reference for latex?

 

[robphy]

BTW, what is the best online reference for latex?

I don't know of the "best"... it really depends on what you are looking for.

This looks pretty good:
http://www.tug.org.in/tutorials.html