Chapter 4: Algebraic Fractions Lesson 3 Addition and Subtraction UNIT TEST # 1 - Jan 24.
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Transcript of Chapter 4: Algebraic Fractions Lesson 3 Addition and Subtraction UNIT TEST # 1 - Jan 24.
OBJECTIVES
Add and subtract rational expressions with the same denominators
Find the LCD of rational expressions
Add and subtract rational expressions with different denominators
When denominators differ only by sign, we can make them equal by changing the sign of the numerator.
The denominator is changed to -1(b – 2) by factoring out -1.
The numerator –a is changed to a and the denominators are now the same.
LCM – is the smallest expression that is divisible by each of the given expressions
LCD – LCM of the denominators To Find the LCM:1. Factor each denominator into prime factors.
2. List each different factor the greatest number of times it appears in any denominator.
Find the LCD for1. Factor each denominator into prime factors.2. List each different factor the greatest number of times it appears in any denominator.
Find the LCD for1. Factor each denominator into prime factors.2. List each different factor the greatest number of times it appears in any denominator.
Find the LCD for
1. Factor each denominator into prime factors.2. List each different factor the greatest number of times it appears in any denominator.