(adsbygoogle = window.adsbygoogle || []).push({}); what do we mean by"minus" energy ??

in the classic physics the minus energy express the gain or loss of the particle ..but when we substitute in the quantum theory lows ,the electron has a minus energy ..I think the energy is not like the charge to be minus ..& I can not also imagine any particle even a small one have a minus energy ..!!!!

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# What do we mean by minus energy ?

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