What does E=mc² actually mean and represent?

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AfRoMaNn
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im pretty sure everyone's familiar with einsteins formula E=mc2 but what is this formula for? E2=m2c4
 
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It's the same equation but with both sides squared. It's like 7E=7mc2 -- not an independent piece of information.
 
Who might be thinking of the formula

[tex]E^2 = p^2c^2+m^2c^4[/tex]

[tex]E=mc^2[/tex] is fine for determining the energy equivalent for the rest mass of a particle. The formula above is more general as it also includes the momentum of the particle and also works for the photon, which has no rest mass.