Newton's Method Completed 2017.notebook

Newton’s Method for finding roots

What can I use to approximate a function at one point?

How does your calculator find roots?

Graph y = x2 – 4  in your calculator Find the zero(s)

What does the calculator ask?

Why? (Think Calculus)

What happens if you make the left bound and right bound the  same?

Why?

Why does the Calculator ask for a guess?

March 23, 2017

Newton's Method Completed 2017.notebook

March 23, 2017

Write the linearization of f(x) @ x = a.

What is easier to find a root of than a curve?

How do we create that?

How would you find the root of what you created above?

When will this root be closer to the root of our desired curve?

Could we repeat this process with the new root as our center of  approximation?

How would we know when to stop this process?

Newton's Method Completed 2017.notebook

March 23, 2017

Write the equation of the tangent line for f(x) at xn 

Find the root of this line.

Would there be a situation when you could not find the equation of  the tangent line?

How could I fix this?

Newton's Method Completed 2017.notebook

March 23, 2017

Newton's Method Completed 2017.notebook

March 23, 2017

Newton's Method Completed 2017.notebook

March 23, 2017

Newton's Method Completed 2017.notebook

March 23, 2017

Newton's Method Completed 2017.notebook

March 23, 2017

Newton's Method Completed 2017.notebook

March 23, 2017

Steps for Newton’s Method 1.  Make a guess where the root exists x1 2. Find the equation of the tangent line at x1.        Let x1 be the center of our approximation.  This is Linearization ­ we are  approximating a function with its tangent  line. 3.  Find the root of the tangent line (plug in 0  for y and solve). 4.  Use that new root as our guess (the center  of our approximation)and calculate the  equation of the tangent line at the new  root. 5.  Repeat this process until approximation is  within a particular tolerance of the actual  root.  |xn ­ xn+1| 6.  xn+1 is the approximation of the root

Newton's Method

Newton's Method won't work if f '(xn) = 0 Fix this problem by making a different guess. Newton's Method may not converge. Fix this problem by making a different guess.

Newton's Method Completed 2017.notebook

Approximate the zero of 

March 23, 2017

within 0.0001

Newton's Method Completed 2017.notebook

Approximate the zero of 

March 23, 2017

within 0.0001

Attachments

Newton's Method Example.gsp

Newton's Method Completed 2017.pdf

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