Explanation Result used: (1) Ratio test : Let ∑ k = 1 ∞ a k be an infinite series and let r = lim k → ∞ | a k + 1 a k | . If r < 1 , then the series ∑ k = 1 ∞ a k is converges. (2) The harmonic series is diverges. (3) The alternating harmonic series is converges. Given: The function h ( x ) = x ln ( 1 − x ) . Calculation: Obtain the power series by using the given result. Consider the function f ( x ) = − x ∑ k = 1 ∞ x k k . g ( x ) = x ln ( 1 − x ) = x ( − ∑ k = 1 ∞ x k k ) = − ∑ k = 1 ∞ x 1 + k k Therefore, the power series representation is − ∑ k = 1 ∞ x 1 + k k . Let a k = x 1 + k k . Then, a k + 1 = x 1 + ( k + 1 ) k + 1 . Use the Ratio test to compute the value | a k + 1 a k | . | a k + 1 a k | = | x k + 2 k + 1 x k + 1 k | Take lim k → ∞ | a k + 1 a k | on both sides, lim k → ∞ | a k + 1 a k | = lim k → ∞ | x k + 2 k + 1 x k + 1 k | = lim k → ∞ | x k + 2 k

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ISBN: 9781323178522

Author: Briggs

Publisher: PEARSON

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Chapter 9.2, Problem 37E

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To find: The power series representation and interval of convergence by using the power series representation f(x)=ln(1−x)=−∑k=1∞xkk, for −1≤x<1.

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Chapter 9.2, Problem 36E

Chapter 9.2, Problem 38E

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The power series representation and interval of convergence by using the power series representation f ( x ) = ln ( 1 − x ) = − ∑ k = 1 ∞ x k k , for − 1 ≤ x < 1 .

Solution Summary: The author explains how to find the power series representation and interval of convergence.

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To find: The power series representation and interval of convergence by using the power series representation f(x)=ln(1−x)=−∑k=1∞xkk, for −1≤x<1.

Want to see the full answer?

Chapter 9 Solutions

The power series representation and interval of convergence by using the power series representation f ( x ) = ln ( 1 − x ) = − ∑ k = 1 ∞ x k k , for − 1 ≤ x &lt; 1 .

Solution Summary: The author explains how to find the power series representation and interval of convergence.

Videos

To find: The power series representation and interval of convergence by using the power series representation f(x)=ln(1−x)=−∑k=1∞xkk, for −1≤x<1.

Want to see the full answer?

Chapter 9 Solutions

The power series representation and interval of convergence by using the power series representation f ( x ) = ln ( 1 − x ) = − ∑ k = 1 ∞ x k k , for − 1 ≤ x < 1 .