Function - Find root

[Wes Loewer]

(10-15-2021 03:20 PM)Arno K Wrote:  But at least it is the same behaviour as my 50G shows when I solve this equation,

An error message indicating that you gave it a "bad initial guess" would be better, but at least the Prime tells you that it found an "Extremum" rather than a root. The 50g actually labels this incorrect point as a "Root".

On the 84+, a bad initial interval produces the error message: "ERROR: NO SIGN CHANGE" which probably isn't much help to a student who doesn't understand the basics of searching for roots.

The Nspire probably has the clearest error message: "Error: No zero found within the specified bounds."

On the Prime, the help screen says, "Root: find the root of the current function that is closest to the tracer". So perhaps the error message should say something like: "No root found near the tracer."