Leerdam (population: 21,028) is a town in the western Netherlands, in the province of South Holland. The municipality covers an area of 35.18 km² (of which 0.36 km² water).
The municipality of Leerdam also includes the following towns, villages and townships: Kedichem[?], Oosterwijk[?], Schoonrewoerd[?].
... b/(2a) to both sides, getting
<math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.</math>
The left side is now a perfect square; it is ...