Lesson 8-2: Adding and Subtracting Rational Expressions.

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Presentation transcript:

Lesson 8-2: Adding and Subtracting Rational Expressions

Adding and Subtracting Rational Expressions Finding Least Common Multiples and Least Common Denominators! – Use prime factorization – Example: Find the LCM of 6 and 4 6 = 2·3 4 = 2 2 LCM= 2 2 ·3 = 12

Find the LCM 1. 18r 2 s 5, 24r 3 st 2, and 15s 3 t 2. a 2 – 6a + 9 and a 2 + a k 3 – 5k 2 – 12k and k 3 – 8k 2 +16k

Add and Subtract Rational Expressions Same as fractions… – To add two fractions we find the LCD, the same thing is going to happen with rational expressions

Examples: Simplify

7.8.

9. 10.