Inverse Functions, Illustrated

I’m cleaning out my email inbox and found this in an old, unread blog post:

(This is the blog post, by Dan Meyer. This is the original source of the image, by Rachel Kernodle.)

My efforts at teaching inverse functions this year were fun, but, alas, not very effective. I started with the “function box,” then added the “inverse function box” with the full range of appropriate sound effects, but the two “boxes” were just too similar. There wasn’t a strong enough visual signal of the opposite-ness of the two kinds of functions. Ms. Kernodle’s stapler/remover analogy could be the key to finally getting the message across.

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