Dividing a radical expression when the denominator is a binomial

The video tutorial explains the difference between monomials and binomials, focusing on the multiplication process. It introduces the concept of conjugates, particularly in relation to zeros, and demonstrates how to multiply by conjugates. The tutorial concludes by emphasizing the importance of understanding these concepts for simplifying expressions.

What is the result of multiplying the expression by its conjugate in the given example?

Why can't the final result be simplified further in the example provided?