mike wightman
SOC-14 10K
Sorry, yes, I misread how you had constructed the equation.Squaring a -C should make the answer positive. (I have been helping my daughter with algebra in middle-school, so I remember that from one of her lessons.)
Problem is you can not have -c in the context in which he originally posted it.
Antimatter is not the same as negative energy.
When energy is used to make a mixture of matter and antimatter you get half of each, recombine them and you get the energy back, less energy lost to the surroundings due to inefficiencies etc.