Learn how to rewrite an expression when taking the square root of a negative number

The video tutorial explains how to rewrite expressions using the imaginary unit I. It begins with an introduction to the concept of replacing the square root of negative numbers with I. The tutorial provides an example of rewriting the square root of -9 by breaking it down into components and using properties of radicals to simplify the expression. The video concludes with a summary of the process, emphasizing the use of the imaginary unit I to simplify expressions.

Explain the process of splitting the radical expression sqrt(9 * -1).

What is the final simplified result of the expression involving the imaginary unit I as discussed?