Negative light speed

According to the equation e = m*c^2, if you equal it to c, there is a negative c as a solution.
If math doesn´t lie, then is physics wrong?

Wowee, we got a brainlet here who only looks at the popular culture representation of physics lads!

But no, the equation e = mc^2 is actually incomplete; Einstein's entire formula is e^2 = m^2c^4 + p^2c^2

p represents a particles momentum; for normal matter, this is just m*v, but it isn't represented like that here because Einstein developed a way to quantify a photon's momentum even though it has no mass.

As a last thought; c is the speed of light. A negative speed, in almost all circumstances, merely represents a specific direction; if you have no direction, you can reorient your reference and redefine -c = c for simplicity in your math.

You're incorrect about everything you said

Wouldn't that just mean light going in the opposite direction?

No, a negative speed is simply a speed that goes to the opposite direction of the one you considered positive, it simply means going backwards.
For example, if you consider downwards positive, a rock falling has positive values for its speed and a balloon rising has negative values for its speed

Congrats, user, you made me lose my shit

you mean like how in particle annihilation you get two particles going in
O P P O S I T E
D I R E C T I O N S ? ? ?

*photons
fugg

>c isn't the speed of light
> e^2 =/= m^2c^4 + p^2c^2

Sqrt (x^2) = |x| by definition.
The square root of a positive number is always positive.