Learn the basics for subtracting two rational expression by finding the LCM

The video tutorial explains how to add and subtract rational expressions by finding the least common denominator (LCD). It covers the process of identifying the LCD for both numbers and variables, and demonstrates how to apply the LCD to simplify expressions. The tutorial emphasizes the importance of creating equivalent fractions and maintaining the same denominator when performing operations on rational expressions.

What is the first step when adding or subtracting rational expressions?

• Multiply the numerators

• Find a common denominator

• Divide the denominators

• Add the numerators directly

What is the least common denominator (LCD) of 8 and 4?

• 16

• 12

• 8

• 4

Which of the following is the LCD for x and x^3?

• x^2

• x^4

• x^3

• x

To make two fractions equivalent, what must be done after multiplying the denominator?

• Divide the numerator by the same factor

• Subtract the same value from the numerator

• Add the same value to the numerator

• Multiply the numerator by the same factor

What should you do after ensuring two fractions have the same denominator?

• Add the denominators

• Multiply the denominators

• Divide the numerators

• Add or subtract the numerators