Adding two basic rational expressions by determining the LCM

The video tutorial explains how to determine the least common multiple (LCM) of algebraic expressions. It begins with an introduction to the concept of LCM, followed by a step-by-step guide on finding the LCM by multiplying expressions. The tutorial then demonstrates how to combine fractions with common denominators and discusses the importance of constraints in the process. The session concludes with a summary of the key points covered.

What constraints should be noted before multiplying the fractions in the example?

What is the purpose of adding the two fractions together in the context of the problem?