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Adding and Subtracting Rational Expressions: Lesson 32

Adding and Subtracting Rational Expressions: Lesson 32. LESSON OBJECTIVES : Determine the least common denominator which is the least common multiple of rational expressions . Adding and subtracting rational expressions. Follow the same rules as adding and subtracting fractions.

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Adding and Subtracting Rational Expressions: Lesson 32

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  1. Adding and Subtracting Rational Expressions: Lesson 32

  2. LESSON OBJECTIVES: • Determine the least common denominator which is the least common multiple of rational expressions. • Adding and subtracting rational expressions.

  3. Follow the same rules as adding and subtracting fractions. • Know how to find the LCD of a rational expression. • Simplify your results. • Add. • Answer.

  4. EXAMPLES: • - = Same denominators, subtract numerators.

  5. EXAMPLES: • += Non-common denominators, multiply to the numerator and denominator of .

  6. EXAMPLES: • • = + = =

  7. The concert promoter’s business analysis suggests that total profit from sale of snack bar items will be related to ticket price 𝑥 by the function 𝒫𝑏(𝑥) = -175𝑥 + 5,250. • Why does it make sense that profit from snack bar sales depends on ticket price?

  8. Write and simplify a rule for the function (𝑥) that gives the profit per ticket from snack bar sales. Remember the number of people attending the concert is related to ticket price by the function (𝑥) = -25𝑥 + 750.

  9. What are the values of +? What do those values tell about the profit prospects for the whole concert event?

  10. Pull out the worksheet titled “Study Guide and Intervention – Adding and Subtracting Rational Expressions”. We will go over some more examples to help you understand how to add and subtract rational expressions more clearly.

  11. HOMEWORK!! • “Skills Practice – Adding and Subtracting Rational Expressions” Worksheet. • “Adding and Subtracting Rational Expressions” Worksheet.

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