Rational Expressions

1
Rational Expressions

• Adding
• Subtracting

2
Finding the Least Common Denominator (LCD)

• Step 1
• Factor the denominators. Write any repeating
  factors in exponential form.
• Step 2
• List different factors. If common factors, list
  the common factor with the highest exponent.
• Step 3
• The LCD is the product from step 2.

3
Finding the Least Common Denominator (LCD)

• http//my.hrw.com/math06_07/nsmedia/lesson_videos/
  alg2/player.html?contentSrc8124/8124.xml

4
Adding Rational Expressions

• Step 1
• Find the LCD (Least Common Denominator)
• Step 2
• Rename each term using the LCD
• Step 3
• Add numerators
• (Keep the Denominator)
• Step 4
• Make sure the answer is in lowest terms

5
Adding Rational Expressions

• http//www.phschool.com/atschool/academy123/englis
  h/academy123_content/wl-book-demo/ph-640s.html

6
Subtracting Rational Expressions

• Step 1
• Find the LCD (Least Common Denominator)
• Step 2
• Rename each term using the LCD
• Step 3
• Subtract numerators
• (Keep the Denominator)
• Step 4
• Make sure the answer is in lowest terms

7
Subtracting Rational Expressions

• http//www.phschool.com/atschool/academy123/englis
  h/academy123_content/wl-book-demo/ph-641s.html