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3

Obviously the correct mathematical answer is to show how the exponent rules actually work, and when they do not work. So please don't accept this answer. Anyway, the educational answer is to see that student is using the fact that $1^2 = (-1)^2$ in the critical middle step. Show them the corresponding fact for cubes, because it's crazy, and might expand ...


1

I'll suggest that the best verbalization is the last one in the question: $a$ equals $b$, which is equal to $c$ Here's why I think so: It's the closest to a literal symbol-by-symbol reading of the chained equation, while still being a grammatically-correct English sentence. Note that this matches the top-voted (but not accepted) answer to the analogous ...


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