Step 1 |an + 1 an + 1 n+ 1 < 1, then Fa, converges absolutely. If lim an Recall the Ratio Test which states that, if a, is a series with nonzero terms, and lim > 1, or lim = 00, then n00 an Sa, diverges. For any fixed value of x such that x * 0, let a, : = n. (-3x)" - - (-3x)^ – 1 (n + 1) Then, (n + 1)(-3x)" an + 1 n+ 2 lim = lim n(-3x)^ - n00 n+1 n+ 1 lim (n + 1)(-3x)" . n + 2 n - 1 n -3x -3.r 3 x Step 2 By the Ratio Test, the series converges if lim n +1 < 1. Therefore, the series converges for x such that 3|x| < 1. n00 an Step 3 Solve to find the values of x such that the series converges. 3|x| < 1 |x| < 1/3V 1/3 Therefore, the radius of convergence is R = 1/3 1/3
Step 1 |an + 1 an + 1 n+ 1 < 1, then Fa, converges absolutely. If lim an Recall the Ratio Test which states that, if a, is a series with nonzero terms, and lim > 1, or lim = 00, then n00 an Sa, diverges. For any fixed value of x such that x * 0, let a, : = n. (-3x)" - - (-3x)^ – 1 (n + 1) Then, (n + 1)(-3x)" an + 1 n+ 2 lim = lim n(-3x)^ - n00 n+1 n+ 1 lim (n + 1)(-3x)" . n + 2 n - 1 n -3x -3.r 3 x Step 2 By the Ratio Test, the series converges if lim n +1 < 1. Therefore, the series converges for x such that 3|x| < 1. n00 an Step 3 Solve to find the values of x such that the series converges. 3|x| < 1 |x| < 1/3V 1/3 Therefore, the radius of convergence is R = 1/3 1/3
Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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