Polynomial roots and stability — a TI-84 Plus CE program

By E-Code · updated 2026-09-26

POLYROOT is a TI-BASIC program for the TI-84 Plus CE. All real roots of a degree 1-5 polynomial by Newton from above plus deflation, a Vieta self-check, and a stable/unstable verdict.

How it's checked

It is checked by E-Code's engineering suite: scripted runs on the TI-BASIC interpreter whose expected numbers were worked out separately in Python. 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 “Polynomial roots and stability” (POLYROOT).
• Put it on your own calculator with a computer and a USB cable, or type it in by hand.

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