Solving Newton's Method for xn with y as a Constant

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SUMMARY

The discussion focuses on identifying the formula x[n+1] = -2x[n] + 3yx[n]^(2/3) as Newton's method for a specific function, where y is a constant. Participants emphasize the need to rearrange the equation to express it in the form of Newton's method, which is x[n+1] = x[n] - f(x[n])/f'(x[n]). The limit of x[n] is also a key point of inquiry, prompting further exploration of the function's behavior as n approaches infinity.

PREREQUISITES
  • Understanding of Newton's method for root-finding
  • Familiarity with limits and convergence in sequences
  • Basic algebraic manipulation skills
  • Knowledge of derivatives and their applications
NEXT STEPS
  • Research the derivation of Newton's method and its applications in numerical analysis
  • Explore the concept of limits in sequences and series
  • Study the behavior of functions under iteration to understand convergence
  • Learn about the implications of fixed constants in iterative methods
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Students studying numerical methods, mathematicians interested in iterative solutions, and anyone seeking to understand the application of Newton's method in solving equations with constants.

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Homework Statement


Identify the formula

xn+1 = -2xn + 3yxn^(2/3)

as the Newton's method for a certain function. Here y is a fixed constant. What is the limit of xn?


Homework Equations


Newton's method?:

xn+1 = xn - f(xn)/f'(xn)


The Attempt at a Solution


I don't know how to begin.

Thanks in advance!
 
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1st step- Newton's method gives

x_n-x_{n-1}=f(x_n)/f'(x_n)

So rearrange your equation to get f(x_n)/f'(x_n). Then think.
 

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