Common Core State Standards
CCSS.Math.Content.8.EE Expressions and Equations
CCSS.Math.Content.8.EE.A Work with radicals and integer exponents.
CCSS.Math.Content.8.EE.A.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. Evaluate square roots of small perfect squares and cube roots of small perfect cubes. Know that √2 is irrational.