My little guy is four years old. He saw me working on my latest doodle notebook page and wanted to help. I think I have a budding mathematician in the house.
That being said, here is a nifty little page that allows you to count and discuss sign changes for f(x) and f(-x). It even has a spot allocated for the number imaginary numbers if you want to go down that road.
You can find this resource at
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