Ragunda is a municipality in north central Sweden, in the county of Jämtland. The municipality covers an area of 2527.2 km². Of the total population of 6313, 3221 are male, and 3092 are female. The population density of the community is 2 inhabitants per km².
... square trinomial of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...