Education Technology

Precalculus: Roots and Cobwebs

by Texas Instruments


  • Students will find roots to equations using the recursive algorithm Fixed Point Iteration (FPI) and will visualize the algorithm as a cobweb plot.


  • recursive sequence
  • convergent sequence
  • Fixed Point Iteration
  • cobweb plot

About the Lesson

This lesson involves finding roots to equations using a method similar to those used by many calculators.
As a result, students will:

  • Find roots using a recursive sequence - Fixed Point Iteration.
  • Visualize this root-finding recursive sequence as a cobweb plot.