ax^2+4x+3=0

Ответ получился -4 и -1???:) 

разложите на множители квадратный трёхчлен 1) х^2-16х+60=? 2) х^2-4х-77=? | -9х^2+8х+1=? -4х^2+3х+1=? |

Ребята, снова прошу вашей помощи!

Нужно составить что-то вроде топика о прогрессе в транспорте:

Вроде: Сначала люди изобрели примитивные лодки, пользовались ими для ловли рыбы и т.д. Потом придумали колесницы...... и т.д.

Вот транспорт:

boat

chariot

carriage

cart

сar

bus

ocean liner

electric train

plane

helicopter

spaceship

Желательно использовать такие фразы:

At the beginning...Then...Later...After some time...With years...Nowadays...In the future...

Заранее спасибо!

Put the verb into the correct form (Past Simple or Present Perfect).

1. I . . . (to see) her recently. She ... (to change) a lot. 2. John . . . (to move) to a new house three days ago. 3. She . . . (to work) at this office for 10 years. Now she ... (to decide) to retire. 4. I don’t think I ... (to know) your wife. I . . . (not to meet) her. 5. John . . . (to see) Susan last week but he . . . (not to see) her since. 6. This African boy . . . (never to see) snow. 7. It . . . (to happen) when I was out. 8. She ... (to take) the envelope, ... (to open) it and . . . (to take) a small sheet of paper out. 9. I . . . (not to see) him of late. 10. When you . . . (to see) Mr Brown?