Explanation Given information: lim b → ∞ b e − b = 0 Formula used: 1. Quotient rule of differentiation : d d x [ f ( x ) g ( x ) ] = g ( x ) f ' ( x ) − f ( x ) g ' ( x ) [ g ( x ) ] 2 2. The rule of Integrationby parts: f ' ( x ) can be calculated by differentiating f ( x ) and G ( x ) can be calculated by integrating g ( x ) , then ∫ f ( x ) g ( x ) = f ( x ) G ( x ) − ∫ f ' ( x ) G ( x ) d x . Proof: Use integral test to determine the infinite series ∑ k = 1 ∞ k e k is convergent. Integral test: Let f ( x ) be continuous, decreasing, and positive for x ≥ 1 . Then, the infinite series ∑ k = 1 ∞ f ( k ) is convergent if the improper integral ∫ 1 ∞ f ( x ) d x is convergent, and the infinite series is divergent if the improper integral is divergent. Let, f ( x ) = x e x is a positive and continuous for x ≥ 1 . Differentiate f ( x ) = x e x with respect to x by using quotient rule of derivative, it gives ⇒ f ' ( x ) = e x − x e x e 2 x ⇒ f ′ ( x ) = ( 1 − x ) e x So, f ' ( x ) is negative for all x > 1 and hence f ( x ) = x e x is a decreasing for x ≥ 1

12th Edition

ISBN: 9780137590810

Author: Larry J. Goldstein, David C. Lay, David I. Schneider, Nakhle H. Asmar, William Edward Tavernetti

Publisher: PEARSON

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Chapter 11.4, Problem 19E

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To prove: The series ∑k=1∞kek is convergent by using the integral test and the factthat limb→∞ be−b= 0.

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Chapter 11.4, Problem 18E

Chapter 11.4, Problem 20E

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Chapter 11 Solutions

Calculus & Its Applications

Ch. 11.1 - Determine the third Taylor polynomial of f(x)=cosx...Ch. 11.1 - Prob. 2CYU Ch. 11.1 - Prob. 1E Ch. 11.1 - Prob. 2E Ch. 11.1 - Prob. 3E Ch. 11.1 - Prob. 4E Ch. 11.1 - Prob. 5E Ch. 11.1 - Prob. 6E Ch. 11.1 - Prob. 7E Ch. 11.1 - Prob. 8E

Ch. 11.1 - Prob. 9E Ch. 11.1 - Prob. 10E Ch. 11.1 - Prob. 11E Ch. 11.1 - Prob. 12E Ch. 11.1 - Prob. 13E Ch. 11.1 - Prob. 14E Ch. 11.1 - Prob. 15E Ch. 11.1 - Prob. 16E Ch. 11.1 - Prob. 17E Ch. 11.1 - Prob. 18E Ch. 11.1 - Determine the third and fourthTaylor polynomial...Ch. 11.1 - Prob. 20E Ch. 11.1 - Prob. 21E Ch. 11.1 - Prob. 22E Ch. 11.1 - Prob. 23E Ch. 11.1 - Prob. 24E Ch. 11.1 - Prob. 25E Ch. 11.1 - Prob. 26E Ch. 11.1 - Prob. 27E Ch. 11.1 - Prob. 28E Ch. 11.1 - Prob. 29E Ch. 11.1 - Prob. 30E Ch. 11.1 - Graph the function Y1=11x and its fourth Taylor...Ch. 11.1 - Prob. 32E Ch. 11.1 - Prob. 33E Ch. 11.1 - Prob. 34E Ch. 11.2 - Prob. 1CYU Ch. 11.2 - Prob. 2CYU Ch. 11.2 - In Exercises 18, use three repetitions of the...Ch. 11.2 - In Exercises 18, use three repetitions of the...Ch. 11.2 - Prob. 3E Ch. 11.2 - Prob. 4E Ch. 11.2 - In Exercises 18, use three repetitions of the...Ch. 11.2 - Prob. 6E Ch. 11.2 - Prob. 7E Ch. 11.2 - Prob. 8E Ch. 11.2 - Sketch the graph of y=x3+2x+2, and use the...Ch. 11.2 - Prob. 10E Ch. 11.2 - Prob. 11E Ch. 11.2 - Prob. 12E Ch. 11.2 - Prob. 13E Ch. 11.2 - Internet Rate of Return An investor buys a bond...Ch. 11.2 - Prob. 15E Ch. 11.2 - Prob. 16E Ch. 11.2 - Prob. 17E Ch. 11.2 - Prob. 18E Ch. 11.2 - Prob. 19E Ch. 11.2 - Prob. 20E Ch. 11.2 - Prob. 21E Ch. 11.2 - Figure 9contains the graph of the function...Ch. 11.2 - Prob. 23E Ch. 11.2 - Prob. 24E Ch. 11.2 - Exercises 25 and 26 present two examples in which...Ch. 11.2 - Prob. 26E Ch. 11.2 - Prob. 27E Ch. 11.2 - Prob. 28E Ch. 11.2 - Prob. 29E Ch. 11.2 - Prob. 30E Ch. 11.3 - Determine the sum of the geometric series...Ch. 11.3 - Prob. 2CYU Ch. 11.3 - Determine the sums of the following geometric...Ch. 11.3 - Prob. 2E Ch. 11.3 - Prob. 3E Ch. 11.3 - Determine the sums of the following geometric...Ch. 11.3 - Prob. 5E Ch. 11.3 - Determine the sums of the following geometric...Ch. 11.3 - Prob. 7E Ch. 11.3 - Prob. 8E Ch. 11.3 - Prob. 9E Ch. 11.3 - Prob. 10E Ch. 11.3 - Prob. 11E Ch. 11.3 - Prob. 12E Ch. 11.3 - Prob. 13E Ch. 11.3 - 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Prob. 39E Ch. 11.3 - Prob. 40E Ch. 11.3 - Prob. 41E Ch. 11.3 - Prob. 42E Ch. 11.3 - Prob. 43E Ch. 11.3 - Prob. 44E Ch. 11.3 - Prob. 45E Ch. 11.3 - Prob. 46E Ch. 11.3 - Prob. 47E Ch. 11.3 - Prob. 48E Ch. 11.3 - Prob. 49E Ch. 11.3 - In Exercises 49 and 50, convince yourself that the...Ch. 11.4 - What is the improper integral associated with the...Ch. 11.4 - Prob. 2CYU Ch. 11.4 - Prob. 1E Ch. 11.4 - Prob. 2E Ch. 11.4 - Prob. 3E Ch. 11.4 - Prob. 4E Ch. 11.4 - Prob. 5E Ch. 11.4 - Prob. 6E Ch. 11.4 - Prob. 7E Ch. 11.4 - Prob. 8E Ch. 11.4 - Prob. 9E Ch. 11.4 - Prob. 10E Ch. 11.4 - In Exercises 116, use the integral test to...Ch. 11.4 - Prob. 12E Ch. 11.4 - Prob. 13E Ch. 11.4 - Prob. 14E Ch. 11.4 - Prob. 15E Ch. 11.4 - In Exercises 116, use the integral test to...Ch. 11.4 - Prob. 17E Ch. 11.4 - Prob. 18E Ch. 11.4 - Prob. 19E Ch. 11.4 - Prob. 20E Ch. 11.4 - In Excercises 2126, use the comparison test to...Ch. 11.4 - Prob. 22E Ch. 11.4 - Prob. 23E Ch. 11.4 - Prob. 24E Ch. 11.4 - Prob. 25E Ch. 11.4 - 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To prove: The series ∑ k = 1 ∞ k e k is convergent by using the integral test and the factthat lim b → ∞ b e − b = 0 .

Solution Summary: The author explains the integral test and the fact that undersetbtoinfty

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To prove: The series ∑k=1∞kek is convergent by using the integral test and the factthat limb→∞ be−b= 0.

Want to see the full answer?

Chapter 11 Solutions