Kelsall is a medium sized agricultural village situated around 8 miles west of the Roman city of Chester in Cheshire, England. The village is situated on Kelsall Hill, which is one of the hills that make up the sandstone ridge that runs along the western side of Cheshire. The ridge includes other hills including Peckforton[?], Beeston, Frodsham and Helsby[?].
... that when computing roots numerically, the usual form of the quadratic formula is not ideal. See Loss of significance for details.
Derivation
The quadratic formula ...