This document discusses nth roots and rational exponents in algebra 2. It explains that a square root is the root of an integer raised to the power of 2, a cube root is the root of an integer raised to the power of 3, and an nth root is the root of a number raised to any positive integer power n. It also covers how to write roots as rational exponents and the properties that the root of a positive number is always a real number while the root of 0 or a negative number may not always be real.