• Syntax: \sqrt[n]{arg} or simply  \sqrt{arg} for \sqrt[2]{arg}
• Ex.: $$$\sqrt[3]{8}$$$ gives

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

• Ex.: $$$\sqrt{-1}$$$ gives

$$\sqrt{-1}$$

• Nesting of roots (and combining with fractions, ...etc.) are possible.
• Ex.: $$$\sqrt[n]{\frac{x^n-y^n}{1+u^{2n}}}$$$ gives

$$\sqrt[n]{\frac{x^n-y^n}{1+u^{2n}}}$$

• Ex.: $$$\sqrt[3]{-q+\sqrt{q^2+p^3}}$$$ gives

$$\sqrt[3]{-q+\sqrt{q^2+p^3}}$$