Latex Ref Test: x2, x3, \nearrow, \sqrt[]{}8

[Gringo123]

x²
x³
x²
$$\nearrow$$
$$\sqrt[]{}8$$

 

[HallsofIvy]

x²
x³
x²
$$\nearrow$$
$$\sqrt[]{}8$$

For just square root (as opposed to cube root, etc.) you don't need the "[ ]". And the 8, assuming it is supposed to be in the square root goes inside the braces:

\sqrt{8} gives $\sqrt{8}$

\sqrt[3]{8} gives $\sqrt[3]{8}$