в полном квадратном уравнении корень может быть равен 0?

Here some facts from the history of st petersburg.

1) Put the facts in the chronological order.

1) The Peter and Paul Cathedral was designed by Domenico Trezzini at the beginning of the eighteenth century.

2) The Mikhailovsky Castle was built by Vasili Bazhenov and Vincenzo Brenna at the beginning of the nineteenth century.

3) St Isaac's Cathedral was decorated by famous Russian painters in the middle of the nineteenth century.

4) The magnificent  kazan Cathedral was built in 1811.

5) St Peterburg was founded by Peter the Great on May 27, 1703.

6) The Victory Monument was created in 1975.

7) The Dutch Church was housed un the beautiful building is Newsky Prospect in 1831-1837.

Составьте поздравление по данной схеме: 1.Обращение к тому кого поздравляют 2.Характеристика повода для поздравления 3.Характеристика поздравляемого 4.Пожелания