Предмет: Алгебра, автор: grisha4121

(x-7)(x+7)+(x-2)^2=11x+30-(x+5)^2

Ответы

Автор ответа: SteelR

0

(x-7)(x+7) + (x-2)² = 11x + 30 - (x+5)²
x² - 49 + x² - 4x + 4 = 11x + 30 - x² - 10x - 25
(x²+x²+x²) + (10x - 11x - 4x) + (25 + 4 - 49 - 30) = 0
3x² - 5x - 50 = 0
x1 = (5 - √625) / 2*3 = - (20/6) = - (10/3)
x2 = (5 + √625) / 2*3 = 30/6 = 5

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Обществознание, автор: tttannyy

что может сделать бедный чтобы разбогатеть х2

6 лет назад

Предмет: Музыка, автор: msongurova

построить и спеть h-moll: t6/4-D5/3-D7-t3

6 лет назад

Предмет: Английский язык, автор: simba85

Нравится + -ing (Like + глагол -ing)
Приведите глагол в правильную герундийную форму (глагол + -ing)

1) I hate _________ (wait) for the bus in the rain.
2) Katya loves _________ (play) with her new kitten.
3) My father hates _________ (come) home late from work.
4) Ivan doesn’t mind _________ (cut) the grass at the family’s dacha.
5) Tatiana likes _________ (hear) the sound of thunder.
6) My grandfather enjoys _________ (make) furniture out of wood.
7) Gleb is shy. I doesn’t like _________ (meet) new people.
8) Natasha likes _________ (go) to the park with her family.
9) Denis hates _________ (feel) lonely. He likes _________ (be) around people.
10) Do you like _________ (do) your English homework?
11) Anna likes _________ (walk) in the forrest.
12) Lena likes _________ (sing) in the choir.
13) I don’t mind _________ (sit) in the back of the bus.
14) Sonya loves _________ (talk) to her cousin in England.
15) Evgeny hates _________ (try) on new clothes.
16) Dmitry likes _________ (sleep) in a tent.
17) The children love _________ (stay) at their grandma’s house.
18) Nadia and Sasha like _________ (feed) the ducks in the pond.
19) Kirill likes _________ (get) emails from his friends.
20) I don’t mind _________ (lend) money to my friends.
21) Alona likes _________ (wear) the new necklace she got for her birthday.
22) My grandpa likes _________ (give) me gifts.
23) I don’t mind _________ (leave) the party early.
24) Olga loves _________ (write) poems.
25) Yelena enjoys _________ (eat) meals with her family.
помогите пожалуйста

6 лет назад

Предмет: Математика, автор: Конфетка113257

Сложите дроби,предварительно сократив их.
32/64 и 10/30

9 лет назад

Предмет: Алгебра, автор: anttyu

Упростите выражение
$(( x + y) ^{2} +( x +y) ^{2} ): ( frac{x}{y} + frac{y} x)$
и найдите его значение при $x= sqrt{7} -1$ , $y = sqrt{7} + 1$

9 лет назад