# 9.2 Adding and Subtracting Rational Expressions - PowerPoint PPT Presentation

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## 9.2 Adding and Subtracting Rational Expressions

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### 9.2 Adding and Subtracting Rational Expressions Least Common Denominator of a polynomial Adding fractions What do you need to add or subtract fractions? – PowerPoint PPT presentation

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Title: 9.2 Adding and Subtracting Rational Expressions

1
9.2 Adding and Subtracting Rational Expressions
• Least Common Denominator
• of a polynomial

2
• What do you need to add or subtract fractions?
• A common denominator
• Of 5 and 3, it is 5 times 3 15
• (Since both are prime numbers)
• We multiply.
• Since both numbers divide into
• 15, it is the Least Common Multiply

3
What is the L.C.M.
• Given the terms
• To find the LCM of the numbers, find there factor
multiplication.

4
What is the L.C.M.
• The LCM is the highest number of each factor
listed from each number.

5
What is the L.C.M.
• The LCM is the highest number of each variable
listed from each term.

6
Find the LCM of two polynomial
• Factor out the polynomial

7
Find the LCM of two polynomial
• Factor out the polynomial

8
Find the LCM of two polynomial
• Factor out the polynomial

9
• Simplify
• What is the LCM of 6 and 14

10
• Simplify
• Common denominator 42a2b2
• What does 6b times 42a2b2
• What does 14a2b2 times 42a2b2

11
• Simplify
• Common denominator 42a2b2
• What does 6b times 42a2b2
• What does 14a2b2 times 42a2b2

12
• Simplify

13
• Simplify

14
• Simplify

15
• Simplify

16
What are the differences between Adding and
Multiplying fractions
• Simplify

17
What are the differences between Adding and
Multiplying fractions
• Simplify

18
What are the differences between Adding and
Multiplying fractions
• Simplify

19
What are the differences between Adding and
Multiplying fractions
• Simplify

20
What are the differences between Adding and
Multiplying fractions
• Simplify

21
What are the differences between Adding and
Multiplying fractions
• Simplify

22
The complex fraction
• Simplify

23
The complex fraction
• Simplify

24
The complex fraction
• Simplify

25
The complex fraction
• Simplify

26
The complex fraction
• Simplify

27
The complex fraction
• Simplify

28
Homework
• Page 482 483
• 15, 19, 25, 29,
• 33, 37, 41

29
Homework
• Page 482 483
• 16, 20, 24, 26,
• 28, 30, 34, 36