Предмет: Алгебра, автор: дельфинчик6661

2x²+13x-7=0. решите плииииз уравнение!!!

Ответы

Автор ответа: Tombola
0
D=169-4*2*(-7)=225.
x1=(-13-15)/4=-7.
x2=(-13+15)/4=0,5.
ответ: -7; 0,5.
Предыдущий вопрос
Следующий вопрос
Похожие вопросы
Предмет: Математика, автор: astana0000
Первый мастер выполняет заказ за 2 ч, второй за 4
ч, а третий за 6 ч. Сколько тенге должен получить
каждый из них, если вместе они будут выполнять
заказ на сумму 22000 тнг.
6 лет назад
Предмет: География, автор: tuluso439
жители канады..................... ​
6 лет назад
Предмет: Английский язык, автор: lizaudzumaki669
СРОЧНО ПОЖАЛУЙСТА Read the text "I love summer".

Five years ago my grandparents lived in the village of Smalville in Florida. We visited them every summer. Every day we helped with their farm. They didn't have a car, but they had a brown horse and a cart. They also had two cows and a very big bull. I wasn't afraid of him because he was good. He was three years old and was born on the farm. My grandparents had some hens and sheep too and a beautiful dog, Ted, but they didn't have any cats. Near their house there was a river. My grandad swam but I didn't because I was too small. We liked the farm. We were very happy there. Last year my grandparents sold their house and some of their animals and moved to a village near Los Angeles. I am glad they didn't sell their horse or their dog. Last month we visited them. Their new house and village are beautiful. I want to visit them again soon.

Choose the correct word order in sentences:

1.
They two cows also had and a very big bull.
They also had two cows and a very big bull.

2.
I wasn't afraid of him because he was good.
I wasn't afraid of him he was good because.

3.
Last year my grandparents sold their house and some of their animals and moved to a village near Los Angeles.
Last year sold their house my grandparents and some of their animals and moved to a village near Los Angeles.
6 лет назад
Предмет: Математика, автор: Maksim315231
выполните действия (7/15-1/6)+2/5 (3/8-1/9)+25/36
9 лет назад
Предмет: Математика, автор: elina2004
задача.Помогите пожалуйста!даю 25 баллов - если 23 какого то числа увеличить в 3 раза и к результату прибавить 57 то получим 129.Какое это число?
9 лет назад