Алгебра
Английский
Биология
География
Геометрия
История
Русский
Обществознание
Физика
Химия
Информатика
Литература
МатематикаВопрос:
Задание №6: Уравнение (2x + 3)^2 = 4 записали в виде ax^2 + bx + c = 0. Какое уравнение получили и его коэффициенты?
Ответ:
Раскрываем скобки: (2x + 3)^2 = 4 -> 4x^2 + 12x + 9 = 4 -> 4x^2 + 12x + 5 = 0. Коэффициенты: a = 4, b = 12, c = 5.
Похожие
- 3.1 Read the situations and complete the sentences using the present perfect. Choose from these verbs: break, disappear, go up, grow, improve, lose, shrink, stop 1. Tom is looking for his key. He can't find it. 2. Maria's English wasn't very good. Now it is better. 3. My bag was here, but it isn't here any more. 4. Lisa can't walk and her leg is in plaster. 5. Last week the bus fare was £1.80. Now it is £2. 6. Dan didn't have a beard before. Now he has a beard. 7. It was raining ten minutes ago. It isn't raining now. 8. I washed my sweater, and now it's too small for me. 3.2 Put in been or gone. 1. My parents are on holiday. They've ___ to Italy. 2. Hello! I've just ___ to the shops. I've bought lots of things. 3. Tom has just ___ out. He'll be back in about an hour. 4. Alice isn't here at the moment. I don't know where she's ___. 5. You're very late. Where have you ___? 3.3 Complete the sentences using the present perfect. 1. Sally is still here. She hasn't gone (she / not / go) out. 2. I can't find my bag. 3. I can't log on to the website. 4. I sent Joe an email this morning, but 5. Is the meeting still going on, or
- Задание № 4. Спишите пословицы и поговорки, раскрывая скобки, вставляя пропущенные буквы и употребляя притяжательные местоимения в нужной форме, укажите их род, число, падеж.
