In Calculus AB a student solved this problem this way and was wondering where they went wrong. I’m rusty so it took me a minute to find the error. Can you?


September 14, 2012


Do we ever teach an algebraic method for handling this?

At first glance, I thought the error was using “or” and not “and”, but then thinking again, I saw the rest. But the way I would think through this problem is graphically, understanding what rational functions look like.

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