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Do Now 6/7/10. Copy HW in your planner. Text p. 816, #4-36 multiples of 4 In your notebook, find the sum and difference of the fractions below. Objective. SWBAT add and subtract rational expressions. Section 12.6 “Add and Subtract Rational Expressions”.

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## Do Now 6/7/10

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**Do Now 6/7/10**• Copy HW in your planner. • Text p. 816, #4-36 multiples of 4 • In your notebook, find the sum and difference of the fractions below.**Objective**• SWBAT add and subtract rational expressions.**Section 12.6 “Add and Subtract Rational Expressions”**• Adding and subtracting rational expressions is similar to adding and subtracting fractions. • Be sure to simplify your answer. Denominator must be COMMON!!!**EXAMPLE 1**Find the sum or difference. Simplify numerator**Least Common Denominator**• The LCD of two or more rational expressions is the product of the factors of the denominators of the rational expressions with each common factor used only once. (Common factors) x (Uncommon factors)**EXAMPLE 2**Find the LCM. (Common factors) x (Uncommon factors) (Common factors) x (Uncommon factors)**EXAMPLE 2**Find the LCM. Because c – 2 and 2c +7 cannot be factored, they don’t have any factors in common. The LCM is the product of c – 2 and 2c + 7.**Adding and Subtracting with Different Denominators**• To add or subtract rational expressions that have different denominators, use the LCD to write equivalent rational expressions that have the same denominator just as you would for numerical fractions.**EXAMPLE 3**Find the sum or difference. LCD = 24x³**EXAMPLE 4**Find the sum or difference. LCD = 3x(x+2)**EXAMPLE 5**Find the sum or difference. LCD = (x+5)(x – 2)(x + 4)**Try it out…Find the sum or difference.**Homework Text p. 816, #4-36 multiples of 4

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