Learn how to simplify a radical square root of a variable expression

The video tutorial covers the simplification of radical expressions, focusing on the nth root and square numbers. It explains how to rewrite expressions using square numbers and the identity rule, and introduces the power rule for quicker simplification. The tutorial concludes with a transition to multiplication.

Explain the identity rule mentioned in the context of square roots.

What is the final answer when simplifying the expression involving k cubed?