Simplifying Rational expressions

The video tutorial covers the process of simplifying trigonometric expressions by factoring. It begins with an introduction to the importance of factoring and the challenges posed by addition and subtraction in expressions. The instructor then explains the grouping technique, a method used to factor expressions with four terms. A detailed, step-by-step application of this technique is demonstrated, showing how to factor out common terms and simplify the expression. The tutorial concludes with a discussion on the limitations of further simplification and the final expression.

How do you determine the common factors when factoring by grouping?

What is the final expression obtained after simplifying the rational expression?