Cannon Street tube station is a London Underground station on the District and Circle lines. Entrances are located on Cannon Street, Dowgate Hill, and on the main-line concourse upstairs at Cannon Street Station, providing an interconnection for commuters.
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... square of 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 ...