Thank you for the link. I'm pretty sure I found it in the Internet Archive's issues of MacWorld from back in the day.
On page 9 (10 in the archive) of the April 1988 issue there is an advert for Eureka: The Solver by Borland International (Of course! They had such excellent software for years.)
There is a writeup about it on pages 191-192 (pages 192-193 in the archive).
One of the tools available is a polynomial finder. That is the tool that I used.
I will look around to see whether I still have the disk.
I also found my favorite, and first computer game since it was my first computer.
Silicon Beach Software put out a game called Airborne! in 1984. I got the Mac in January 1985 and bought that game with it. Fun stuff!