Factor an expression by Grouping - Help me factor - Help me with my math

The video tutorial explains the process of factoring by grouping, a method used to simplify expressions with four terms. It begins by identifying common factors among terms and rearranging them into groups. The tutorial demonstrates how to factor out common variables and constants, ensuring variables remain positive. The process is completed by applying the distributive property to verify the results, ultimately simplifying the expression.

Explain the importance of keeping variables positive when factoring.

What is the final result after factoring the expression mentioned in the text?