Simplify two rational expression by adding

The video tutorial explains how to add rational expressions by finding common denominators. It emphasizes the importance of common denominators and provides a step-by-step example using the fractions 2/3 and 1/4. The tutorial demonstrates how to multiply denominators to find a common denominator and highlights the process of simplifying expressions through factoring and the distributive property. The video concludes with a final simplification of the expression, ensuring a clear understanding of the process.

What should you do to the numerator when you multiply the denominator by a certain value?

Describe the process of simplifying the expression after finding a common denominator.