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If x is undefined? You mean if x = a/0, or something? I don’t think you can square undefined, no.
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By undefined I meant is a variable, sorry.
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He means if x is not any specific number but could represent a range of numbers, as generally occurs in algebra.
/me considers splitting this whole offtopicness off into its own thread but is frightened about what that would imply about the level of geekiness of these forums.
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Make that thread.