Préfecture (capital): Nantes
Sous-préfectures: Ancenis[?], Châteaubriant[?] and Saint Nazaire[?].
See list of: Communes of the Loire-Atlantique département
... The formula reads <math> x=\frac{-b \pm \sqrt {b^2-4ac}}{2a} </math> The term b2 – 4ac is called the discriminant of the quadratic equation, ...