Simplify a rational expression by factoring a trinomial

The video tutorial explains how to solve an algebraic expression by factoring. It begins with an introduction to the problem, highlighting the importance of understanding term separation by operations like addition, subtraction, multiplication, and division. The teacher then demonstrates the process of factoring the expression, identifying numbers that multiply and add to specific values. After factoring, the division property is applied to simplify the expression further. The tutorial concludes with the final solution and a discussion on constraints, ensuring the denominator does not equal zero.

Why can you apply the division property after factoring the expressions?

What values cannot be substituted for X in the final answer?