## Finding the LCD of rational expressions

Finding the LCD of rational expressions
• Currently 4.0/5 Stars.
6275 views, 1 rating - 00:09:21
Part of video series Rational Expressions
Taught by YourMathGal

### Meets NCTM Standards:

More free YouTube videos by Julie Harland are organized at http://yourmathgal.com
This video shows a method for finding the least common denominator of rational expressions. I've posted at least 2 other videos with methods, explanations, and examples for finding the LCD.
• What is the least common denominator or LCD?
• How do you find the least common denominator of algebraic fractions?
• What is the least common denominator of 3/2x^2 and 5/6xy?
• How do you find the LCD of algebraic fractions if the denominators are not factored?
• How do you find the LCD of x/(9x + 9) and (x + 4)/6x?
• What is the LCD of (3x + 5)/(x - 7) and 4/(x + 5)?
• What is the least common denominator of 5/(7x - 14) and 3x/(x^2 - 4)?
• How do you find the least common denominator of 3 algebraic fractions?
• What is the LCD of 4/(3x + 15), 1/(4x - 20), and 1/(x^3 - 25x)?
This lesson shows how to find least common denominators when there are variables involved. The methods shown for finding the least common denominator are the same as with just numbers; you will just have to deal with algebraic expressions now. Several examples are shown and explained in this video.
• Currently 4.0/5 Stars.
Reviewed by MathVids Staff on May 22, 2010.