Function - Find root

[StephanP]

   
   
Only when the cursor is at a slope wherein the root lies, it is actually properly found.
This helps me understanding the underlying algorithm and also helps my explaining things to my students.
But it still feels strange to me that when i issue a command Find root, that the calculator chooses to give me an extreme as a result. That's confusing to me and for sure for students who are trying to figure out how to work with a graphic calculator.
Things could be made more clear, e.g. by simply saying: No root found!