1. Lesson 90 Warm Up
Pg. 592

2. Adding and Subtracting Rational Expressions
Algebra 1 Lesson 90
Adding and Subtracting Rational Expressions

3. Example 1 Add or subtract. Simplify your answers. 2x2 + 3x2 20x 20x
3a – 2 _ a – a a + 2
z3 – 10z z z2 – 3z z2 – 3z -18

4. Example 2
Add. Simplify your answers. 2h4 + 4h2 6h 2h2

5. Example 3
Subtract. Simplify your answers.
x _ x – x2 + x - 20

6. Example 4
Add. Simplify your answer.
v – v – v

7. Example 5
A plane flies 2000 miles with a headwind and makes the return trip with a tailwind. Write and simplify an expression for the total time of the round-trip flight assuming that the wind speed w remains constant and the plane’s rate averages 500 miles per hour.

8. Lesson 90 Homework
Pg. 595 Practice, WS #90