1. Add & Subtract Rationals – Common Denominator
To add or subtract rational expressions with common denominators:
1) Add or subtract the numerators
2) Write the result over the common denominator
3) Simplify

2. Example 1
Add the two rational expressions.
Note that the denominators are common.
Add the numerators.
Write the sum over the common denominator.
Simplify

3. Example 2
Subtract the two rational expressions.
Note that the denominators are common.
Subtract the numerators.
Write the difference over the common denominator.

4. Simplify

5. Example 3
Subtract the two rational expressions.
Note that the denominators are common.
Subtract the numerators.
Important: the subtraction sign applies to the whole numerator!
Write the difference over the common denominator.

6. Simplify the numerator
Note the sign change
Simplify the rational expression

7. Click to rerun the slideshow.
END OF PRESENTATION
Click to rerun the slideshow.