Many other problems may be caused by of the coast. The quality of rivers has also declined. Many of them are “ dead”, i.e. to support fish and wildlife.

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получается делаем так:

сначала решаем уравнение как и обычно т.е. теоремой виетта или дискриминантом

х^2-4х+3=0

я решу теоремой виетта:

сумма корней равна 4

произведение 3

значит корни 1 и 3

далее:

есть такая формула разложение на множетели квадратного уравнения выглядит так:                 a(x-x1)(x-x2), где а-множетель перед квадратом в нашем случае это 1, х1 и х2 - корни. 

подставим в неё наши корни, получим  (x-1)(x-3)=0

так а теперь решим это неравенство  (x-1)(x-3)> 0

методом интегралов ( тут 3 промежутка от минус бесконечности до 1 от 1 до 3 и от 3 до плюс бесконечности):

допустим х =0, подставим (0-1)(0-3)=3 знак + значит в промежутке от минус бесконечности до 1 знак + 

от 1 до 3 знак -

от 3 до плюс бесконечности +

ответ: х принадлежит промежутку  от минус бесконечности до 1 и  от 3 до плюс бесконечности

Minsk is the capital of the Republic of Belarus, its political, economic, cultural and scientific center. It is an ancient city and dates back to the 11th century. There is one version of how it came into being. Gleb Vseslavovich took proposition of Minsk from his father and made it the capital of an independent Principality. There are certain proofs that it was a flourishing commercial center located at the crossroads of the traditional trade rout from east to west and from north to south.

Minsk is situated on the river Svisloch and occupies an area of 200 square kilometers. Its population is about 2 million people. During the Great Patriotic War Minsk was destroyed by German invaders almost completely. Minsk lay in ruins. The people of Belarus rebuilt the city. Victory Square, the Eternal Flame at the monument commemorates soldiers, underground fighters, partisans who fell in the battles for freedom f our motherland. The names of many streets of the city commemorate many heroes.