New York State Learning Standards and Core Curriculum
NY-8.EE. Expressions, Equations and Inequalities
Work with radicals and integer exponents.
NY-8.EE.2. Use square root and cube root symbols to represent solutions to equations of the form x^2 = p and x^3 = p, where p is a positive rational number. Know square roots of perfect squares up to 225 and cube roots of perfect cubes up to 125. Know that the square root of a non-perfect square is irrational.