tailieunhanh - Calculus and its applications: 1.6

"Calculus and its applications: " - Objective: differentiate using the product and the quotient rules; use the quotient rule to differentiate the average cost, revenue, and profit functions. | 2012 Pearson Education, Inc. All rights reserved Slide Differentiation Techniques: The Product and Quotient Rules OBJECTIVE Differentiate using the Product and the Quotient Rules. Use the Quotient Rule to differentiate the average cost, revenue, and profit functions. 2012 Pearson Education, Inc. All rights reserved Slide THEOREM 5: The Product Rule Let Then, Differentiation Techniques: The Product and Quotient Rules 2012 Pearson Education, Inc. All rights reserved Slide Example 1: Find Differentiation Techniques: The Product and Quotient Rules 2012 Pearson Education, Inc. All rights reserved Slide Differentiation Techniques: The Product and Quotient Rules Quick Check 1 Use the Product Rule to differentiate each of the following functions. Do not simplify. a.) b.) 2012 Pearson Education, Inc. All rights reserved Slide THEOREM 6: The Quotient Rule If then, Differentiation Techniques: The Product and Quotient Rules 2012 Pearson Education, Inc. All rights reserved Slide Example 2: Differentiate Differentiation Techniques: The Product and Quotient Rules 2012 Pearson Education, Inc. All rights reserved Slide Differentiation Techniques: The Product and Quotient Rules Quick Check 2 a.) Differentiate: . Simplify your result. b.) Show that 2012 Pearson Education, Inc. All rights reserved Slide DEFINITION: If C(x) is the cost of producing x items, then the average cost of producing x items is If R(x) is the revenue from the sale of x items, then the average revenue from selling x items is If P(x) is the profit from the sale of x items, then the average profit from selling x items is Differentiation Techniques: The Product and Quotient Rules 2012 Pearson Education, Inc. All rights reserved Slide Example 3: Paulsen’s Greenhouse finds that the cost, in dollars, of growing x hundred geraniums is given by If the revenue from the sale of x hundred geraniums is given by find each of the following. a) The average cost, the average revenue, and the average profit when x hundred geraniums are grown and sold. b) The rate at which average profit is changing when 300 geraniums are being grown. Differentiation Techniques: The Product and Quotient Rules 2012 Pearson Education, Inc. All rights reserved Slide Example 3 (continued): a) We let AC, AR, and AP represent average cost, average revenue, and average profit. Differentiation Techniques: The Product and Quotient Rules 2012 Pearson Education, Inc. All rights reserved Slide Example 3 (continued): b) First we must find AP (x). Then we can substitute 3 (hundred) into AP (x). Differentiation Techniques: The Product and Quotient Rules NOTE: In the textbook, on p. 164, they substitute in 300 (instead of 3). 2012 Pearson Education, Inc. All rights reserved Slide Example 3 (concluded): Thus, at 300 geraniums, Paulsen’s average profit is increasing by about $ per plant. Differentiation Techniques: The Product and Quotient Rules 2012 Pearson Education, Inc. All rights reserved Slide Differentiation Techniques: The Product and Quotient Rules Section Summary The Product Rule is: The Quotient Rule is: Be careful to note the order in which you write out the factors when using the Quotient Rule. Because the Quotient Rule involves subtraction and division, the order in which you perform the operations is important.