Bisection root finder — a TI-84 Plus CE program

By E-Code · updated 2026-09-26

BISECT is a TI-BASIC program for the TI-84 Plus CE. Solves cos(x)=x by bisection over [0,1] to the Dottie number, ≈0.739.

How it's checked

It is run on the TI-BASIC interpreter by E-Code's automated library checks, which also check a computed answer where one is easy to state. It has no oracle case file, so this page gives no case count.

How E-Code checks every program

Run it or put it on your calculator

• Open the library in the TI-84 Plus CE calculator and pick “Bisection root finder” (BISECT).
• Put it on your own calculator with a computer and a USB cable, or type it in by hand.

Related programs

• Newton-Raphson root finder
• Numerical integration lab
• Newton's method with an iteration table
• Law of Cosines solver
• Quadratic formula solver

All TI-84 Plus CE math programs · All TI-84 Plus CE programs