Newton's Method (INTERSECTION POINTS)

Click For Summary
SUMMARY

The discussion focuses on finding the x-coordinate of the intersection points between the functions tan(x) and 5x using Newton's Method. The equation set up is 0 = tan(x) - 5x, with an initial guess of x_0 around 1.5. Participants confirm that x = 0 is a valid solution, but emphasize the need for a better starting point to locate the other intersection point. The application of Newton's Method is highlighted as essential for refining the solution.

PREREQUISITES
  • Understanding of Newton's Method for root-finding
  • Familiarity with trigonometric functions, specifically tan(x)
  • Basic calculus knowledge, including derivatives
  • Graphing skills to visualize function intersections
NEXT STEPS
  • Implement Newton's Method in Python using libraries like NumPy
  • Explore the behavior of tan(x) and its periodicity
  • Study convergence criteria for Newton's Method
  • Learn about alternative root-finding methods such as the Bisection Method
USEFUL FOR

Students in calculus, mathematicians, and anyone interested in numerical methods for solving equations involving trigonometric functions.

Jharr94
Messages
6
Reaction score
0

Homework Statement


Find the x-coordinate of the first point in the region where intersects . Give your answer to 6 significant figures.


Homework Equations


x_1=x_0- (f(x)/f'(x))


The Attempt at a Solution


I equated the two equations and got:
0=tanx-5x

I also looked at the graph and got that the intersection point is around 1.5

I used Newton's method but the only thing I keep getting is 0, can anyone help me to find the OTHER intersection point?
 
Physics news on Phys.org
I assume that since you know the point of intersection is around 1.5, that is the value you are using as your guess x_0 in Newton's method?If so, you will have to show me your work for me to be able to see where you are going wrong.
 
First, x= 0 is obviously a solution of tan(x)= 5x. Using a starting point close enough to a positive solution should work.
 

Similar threads

Replies
9
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 9 ·
Replies
9
Views
4K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 15 ·
Replies
15
Views
3K
  • · Replies 15 ·
Replies
15
Views
3K
  • · Replies 5 ·
Replies
5
Views
2K