как решать полные кводратные уравнения
Например:
x в квадрате +16x+11=0
x в квадрате-8x-15=0
x в квадрате -10x-24=0
x в квадрате -5x +3=0
x в квадрате+7x+2=0

IV. Из данных групп предложений, содержащих придаточные предложения условия, спишите те, в которых действие могло бы относиться к настоящему или будущему времени. Подчеркните сказуемые и переведите предложения

1. а) If more users were connected to computer networks, e-commerce would develop more rapidly.

b) If more users had been connected to computer networks, e-commerce would have  developed  more rapidly.

2. a) The company would have achieved a higher sales level, if the retail price had been decreased.

b) The company would achieve a higher sales level, if the retail price was decreased.

3. a)Unless experienced managers were hired, such a big corporation would not run business so successfully.

b) Unless experienced managers had been hired, such a big corporation would not have run business so successfully.

4. a) If governments had reduced restrictions and tariffs, it would have promoted the expansion of world trade.

b) If governments reduced restrictions and tariffs, it would promote the expansion of world trade.

5. a) If the enterprise applied innovations more effectively, its profits would rise.

b) If the enterprise had applied innovations more effectively, its profits would have risen.