Предмет: Математика, автор: Positivna9l

Решите уравнение:
7х^2-28=0

Ответы

Автор ответа: iliafilippov
2

Ответ:

x1=-2; х2=2

Пошаговое объяснение:

7х^2-28=0

x^2-4=0

x^2=4

x=+-2

x=-2

x=2

Предыдущий вопрос
Следующий вопрос
Интересные вопросы
Предмет: Русский язык, автор: kolesechka

подобрать синоми к словам:родник,льется,глядите,родина
2 года назад
Предмет: Английский язык, автор: Аноним
перевод на руссский.
Текст:

I

The day of the surfing competition was hot and

sunny.

The waves were very big but Nick was a strong

swimmer and his new board was good. He sat

on it in the water and waited.

A big wave arrived and Nick started to swim

strongly. Nick caught the wave well ami

up on his board. The people on thel

watched — it was exciting to watch. Sna

Nick heard a noise.

A surfboard hit his right arm. He fell rn

board. A second big wave hit him and 1

Brian's board coming at him.

His head went under the water. The waten

his mouth. His arm was hurt. He started •

but it was not easy.

II

He sat down on his board and move:

towards the beach. He was tired and it ма

ficult to move his right arm. When he a

he put his board under his left arm. H*i

hardly walk.

People looked at him. Some of them stzn

talk to him, but he didn't want to talk. Hei

the beach and looked at the waves.

Janelle walked across the beach to him. "Wl

you fall, Nick? That was a good wave

caught it very well.

"It was Brian. He came at me on his boam

hit me. I hurt my arm — but perhaps it *

accident."

"An accident? I don't think so. I sawcut

across you (подрезал тебя). It vm

dangerous."

"Well, I lost the competition. Brian has ш

it's goodbye to my plans to go to Australia i

college."
2 года назад
Предмет: Другие предметы, автор: KubikBoy
Школьная форма. Мнение за и против
2 года назад
Предмет: Геометрия, автор: PlayerZnanija
Основания равнобедренной трапеции равны 16 и 96, боковая сторона равна 58 . Найдите длинну диагонали трапеции
8 лет назад
Предмет: Физика, автор: Умник9467
электропоезд идущий по расписанию со скоростью 60 км/ ч задержали в пути на 5 мин машинист ликвидировал опоздание на перегоне в 25 км с какой скоростью прошёл электропоезд этот перегон:???
8 лет назад