Combining rational expression with like denominators

The video tutorial explains how to combine and simplify rational expressions. It begins by identifying that the denominators are the same, allowing for the combination of expressions. However, the numerators have different variable factors, preventing direct combination. The tutorial then demonstrates how to simplify the expression by factoring out common terms. Finally, it discusses writing constraints to ensure the denominator is not zero, concluding with a reminder of the importance of these steps in adding rational fractions.

What constraint can be established for the variable X in the context of the rational expressions?

Explain the importance of not having a zero in the denominator of a rational expression.