https://openlab.citytech.cuny.edu/groups-mat-1275co-course-hub-/lessons/lesson-17-roots-and-rational-exponents/

Openstax sections:

8.1 Simplify Expressions with Roots

8.3 Simplify Rational Exponents

WeBWorK sets:

HigherRoots
HigherRoots-Algebraic

RationalExponents