Intersecting circles using Newton's Method

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SUMMARY

The discussion focuses on using Newton's Method to find the intersection of two circles represented by equations. The initial approach of equating the two equations was incorrect, as it led to a linear equation rather than a suitable form for iteration. Participants emphasized the importance of correctly setting the equations in the form f(x) = g(x) to derive the iterating function. Additionally, the need for a proper initial condition was highlighted to effectively apply Newton's Method.

PREREQUISITES
  • Understanding of Newton's Method for root-finding
  • Familiarity with equations of circles in Cartesian coordinates
  • Knowledge of Taylor's theorem in two dimensions
  • Ability to manipulate and solve nonlinear equations
NEXT STEPS
  • Study the application of Newton's Method for systems of nonlinear equations
  • Learn how to derive iterating functions from implicit equations
  • Explore the geometric interpretation of circle intersections
  • Investigate the role of initial conditions in iterative methods
USEFUL FOR

Mathematics students, educators, and anyone interested in numerical methods for solving nonlinear equations, particularly in the context of geometric problems involving circles.

Robb
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Homework Statement


upload_2017-11-8_20-33-41.png


Homework Equations

The Attempt at a Solution


My initial thought was to set the two equations equal to each other but the resulting equation is linear which gives a constant for a Newton iteration. I thought about Taylor's theorem in 2-d but I'm not so sure about that as far as deriving the iterating function. Please help!
 

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Robb said:

Homework Statement


View attachment 214649

Homework Equations

The Attempt at a Solution


My initial thought was to set the two equations equal to each other but the resulting equation is linear which gives a constant for a Newton iteration. I thought about Taylor's theorem in 2-d but I'm not so sure about that as far as deriving the iterating function. Please help!
Technically, you don't "set equations equal to each other." If you have one equation in the form f(x) = b and another equation in the form g(x) = b, then you can set f(x) equal to g(x). However, it makes no sense to write ##(x - 2)^2 + (y - 1)^2 = 2 = 3.5 = (x - 2.5)^2 + y^2##.

For the equations in your problem, what you said amounts to setting 2 = 3.5, which is obviouly untrue.

What was the work that you did? You need to show us what you did, rather than just loosely describe your work, so that we can steer you in the right direction.
 
upload_2017-11-9_6-16-48.png


I have not chosen an initial condition yet so I can get F(X).
 

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