Question

i luv u
$\sqrt[?]{?}$
${4 \gamma }^{2}$
888888

Answer 1

after reading egreg's comment, changing from \sqrt[3]{x} to \root 3 \of{x}, to indicate using plain TeX, not LaTeX

Consider $$\sqrt{x}$$ vs $$\root 3 \of{x}$$.

The latter has a 'root' of 3.

How do we typeset this?

On page 443 of the TeX Book, rule 11, it describes typesetting the radical atom: \radcal and \sqrt. However, it only describes "root-less" types, like \sqrt{x}, and not the ones with a root, like \root 3 \of{x}