Strängnäs is a municipality in central Sweden, in the county of Södermanland at Lake Mälaren. The municipality covers an area of 735.9 km². Of the total population of 29610, 14680 are male, and 14930 are female. The population density of the community is 40 inhabitants per km². An important landmark is the cathedral, Strängnäs domkyrka[?] built around 1250.
... the usual form of the quadratic formula is not ideal. See Loss of significance for details.
Derivation
The quadratic formula is derived by the method of completing the ...