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That's the x coordinate of the vertex of the parabola.

|dw:1358899619402:dw|

Isnt there a specific name for it?

|dw:1358899644529:dw|

|dw:1358899664360:dw|

since the parabola can reflect over that line and match up with itself

I know what it does. Im just curious if there is a name for it.

i just told you lol

-b/2a gives you the axis of symmetry