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# Precal 20 S Adding And Subtracting Rational Expressions

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### Precal 20 S Adding And Subtracting Rational Expressions

1. 1. Adding and Subtracting  Rational Expressions  1
2. 2. 2
3. 3. 3
4. 4. Recall: When adding / subtracting fractions, always look for LCD ex. 3 2 4 7 ex. 5 3 + 6 7 4
5. 5. To Simplify Algebraic Fractions: 1. Factor / Find LCD 2. Change fractions to have common denominators 3. Add / Subtract 4. Simplify / reduce 5. Restrictions on variables ex. 6 + 8 7x 7x ex. 2x 6 x­3 x­3 5
6. 6. ex. 4 6 x + x2 ex. 2 5 + 3x 2x 6
7. 7. ex. 4 5 x+3 x­2 ex.  3 2 x2­x x2­1 7
8. 8. x­3 + x­1 ex. x2+2x­15 x+5 8
9. 9. ex 2 + 1 2 2 x ­ 4 2x ­ x 9
10. 10. 2 3 4x x­3 + ­ 2 x+3 x ­ 9 10
11. 11. 1 ­ 2x + 3 x2­4 x+2 2 ­ x 11
12. 12. 5x 3 2  x  ­ 25 + ­ 2x 5  ­ x 2 x  + 4x ­ 5 12
13. 13. Assignment: Exercise # 44 omit # 13