How to find the difference between two rational expressions with unlike denominators

The video tutorial explains how to identify and use the least common denominator (LCD) to add fractions. It covers the rules of exponents, finding the LCD of numbers and variables, and multiplying fractions to achieve the LCD. The tutorial concludes with a practical example of calculating common denominators.

What is the first step in finding the least common denominator (LCD) according to the text?

How do you determine the LCD of the numbers seven and four?

What is the least common denominator of the variables X and X?

Explain the process of multiplying fractions to obtain the LCD.

What does it mean to produce equivalent equations when multiplying fractions?