Предмет: Алгебра, автор: vel99565

5 х в квадрате + 4х -1=0

Ответы

Автор ответа: insafmen
4
5х^2+4x-1=0
a        b  c
D=b^2-4*a*c
-16-20=36
x1=6-5/2*1=0,5
х2=6+5/2*1=7,5 
Ответ:
х1=0,5
х2=7,5 надеюсь,поймешь

Автор ответа: Rossomaxa2001
4
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Приложения:
Похожие вопросы
Предмет: Русский язык, автор: liza1483
Предмет: Английский язык, автор: vinogradka009
1. a. What ……………………………………. (you/do) tonight?
b. ……………………………………………………(I/meet) John at nine.
2. a. Why don’t you go to the park?
b. You must be joking! The sky is so cloudy that ……………………………………………(it/rain/soon).
3. a. …………………………………………………(you/really/buy) a new bike?
b. Yes, the one I’ve got is too old.
4. a. ………………………………………..(they/not/go) to the Dolomites if we don’t go with them
b. You know that we can’t. ……………………………………………….(I/work) the whole weekend.
5. a. I enjoyed my stay in Italy so much that I’m sure…………………………………..(I/ go back) next year.
b. Oh great! If you go, ………………………………………….(I/join) you.
6. a. I’m sure that by 2030 …………………………………….(there/be) robots in every house and office.
b. Maybe, but …………………………………………………..(they/not/replace) us completely.
7. a. …………………………………………….(we/move) into our new flat next August.
b. Oh, are you? ………………………………………….(you/invite) me to dinner when you settle down?
8. a. Next month your daughter ………………………(be) eighteen. What ………………………(you/do)?
b. ……………………….(we/give) a party and …………………..(we/buy) her a car by the end of the month.
9. a. Haven’t we got time for a drink?
b. I’m sorry but ………………………………………..(the train/leave) in 30 minutes.
10. a. It’s so hot in here! …………………………………………….(I/ open) the window.
b. Good idea! ……………………………………………………(it/be) cool soon.