Multiply two rational expressions and use the division property to simplify our answer

The video tutorial covers the process of simplifying mathematical expressions before multiplication. It begins with an introduction to the concept, followed by a detailed explanation of factoring numerators and denominators. The tutorial then demonstrates how to simplify expressions by combining terms and concludes with the final simplification and identification of restrictions, such as values that variables cannot take.

What restrictions are mentioned regarding the variable 'A'?

What rule is stated for multiplying in the context of the lesson?