A quadratic function has a extreme point which is called vertex.
This point correspond to the maximum or the minimum value of the function depending on the sign of the quadratic coefficient.
In physics many representations of movement of objects are represented with quadratic equations, like a projectile trajectory. In those cases, the vertex may represents the maximum height.
When representing the mechanical energy of a particule with a quadratic function, the verex can represent the equilibrium point as it corresponds to a minimum.
In business, it depends on what variable we are representing with that function. Whatever the function represents, the vertex will represent a maximum or a minimum for that variable.