Предмет: Алгебра, автор: ve2009ka

1. Функцiю задано формулою у=3x²+4. Знайдіть: a) значення функції, якщо значення аргументу дорівнюе -1; 1; 2; б) за якого значення аргументу значення функції дорівнює 4.
срочно пожалуйста

Ответы

Автор ответа: yanata101

у = 3x² + 4

а) якщо х = - 1, то у = 3x² + 4 = 3•(-1)² + 4 = 7;

якщо х = 1, то у = 3x² + 4 = 3•1² + 4 = 7;

якщо х = 2, то у = 3x² + 4 = 3•2² + 4 = 16;

б) якщо у = 4, то 3х² + 4 = 4, 3х² = 0, х = 0.

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: История, автор: victoriamatyunina1

1. Эпоха, когда орудия труда из металла вытеснили каменные орудня труда: А) палеолит; В) мезолит; С) неолит; Д) энеолит; Е) бронзовый век
помогите пожалуйста

11 месяцев назад

Предмет: Химия, автор: Katja5689

Які фізичні властивості визначають візуально, які – вимірюванням?

11 месяцев назад

Предмет: История, автор: eldarguliev08

Напишіть історичний портрет на 2 сторінки звичайного зошита, про діячів Французької революції. Даю 30 балів.

11 месяцев назад

Предмет: Английский язык, автор: krekershtefan

Choose the correct item (выбери верный вариант ответа).
e.g. Matt usually ...B.... his homework after school.
A doing
B does
C do
1 Mr Williams is a .......... . He always delivers our letters.
A taxi driver
B postman C baker
2 I .......... new to the school.
A is
B are C am
3 There are six ..........on the table.
A knives
B knife
C box
4 I'm American. I’m from ........... .
A the USA B the UK
C Canada
5 Has Jim got ......... book?
A those
B these
C this
6 Danny lives on the …….. floor.
A one B two
C ground
7 Whose house is that? It’s ……… house.
A Katies’
B Katie C Katie and Jack’s
8 Who’s Kathy? She’s Laura’s ........ .
A father
B brother
C mother
9 You ……..be quiet in the classroom.
A mustn’t
B must
C always
10 Sue and I are friends. ........... walk to school together.
A We
B They
C You
11 Ellen is going on safari. She ........... to see lions.
A want
B will
C wants
12 “........... you help me carry this box?” “Of course!”
A Will
B Do C Are
13 What are you ….. now?
A does B do
C doing
14 Rhinos have got horns ............ their heads.
A on B up C out
15 We haven’t got ........... milk in the fridge.
A any B some
C a
16 Have you got the time, please? Yes, it’s half ........... six.
A after
B before
C past
17 Sam wears ........... in the summer because it’s hot.
A trousers
B coats
C shorts
18 We eat breakfast in the ........... .
A morning
B afternoon C evening
19 How ........... rice can you eat?
A much
B many
C some
20 Can you put ............ rice in my bowl, please?
A any B a C some
21.“Would you like to come fishing with me?” “No, thanks! It's………….”
A exciting
B boring
C enjoyable
22 Put ........... your scarf and gloves. It’s cold today!
A away
B on C in
23 Will you come sailing with me? No, I ........... .
A will
B don’t
C won’t
24 Do I look all right in this? Yes, ........... fits you perfectly!
A they
B its C it
25 Have you got a toothache? You must see a …….. .
A doctor
B dentist
C teacher
26 You .......... go skiing. There isn't any snow!
A can’t
B can
C must
27.“Why don' I you come sailing?” “I’m sorry, but I ……..”
A can' t
B am not
C don' t
28 .. . .. . . . .. . time does the party start?
A When
B What
C Where
29 This house belongs to John. It’s ………. house.
A her B our C his
30 My hobby is walking. I like to go ………. in the mountains.
A swimming
B sunbathing C hiking
B. Choose the correct response (Выбери верный ответ).
e.g. Can I take pictures here?
a) No, you don’t. b) Sorry, you can't.
31 Is there any milk?
a) Yes, there is. b) No, it isn’t.
32 How can I help you?
a) Yes, please. b) I’m looking for a teddy bear.
33.Where is the bathroom?
a) It’s in front of the sofa. b) It’s on the first floor.
34 Enjoy your meal!
a) Thank you. b) I ’ d love to.
35.Where is she from?
a) In London. b) The UK.
С. Read the text and mark the sentences T (true) or F (false)
(Прочитай текст и отметь предложения после текста - «верно» (T) или
«неверно» (F)).
Dear Lisa,
Hi from sunny Mexico! I am having a great holiday with my family. My little brother
swims all day. I think he'll turn into a fish. Mum is relaxing and sunbathing on the beach
now. Dad says he won't ever get tired of fishing. I am going scuba diving this afternoon.think it will be very exciting! You won't believe how beautiful it is here. I'll show you all
the photos when I come home. I hope you are having fun at home. Maybe next year
you'll spend your holiday with us.
Love,
Kelly
1 Kelly's little brother really likes swimming. - T/F
2 Kelly's mother is sunbathing today. – T/F
3 Kelly's father doesn't like fishing. – T/F
4
Kelly is going white water rafting. - T/F

6 лет назад

Предмет: Математика, автор: iskakivadianka

вишневое варенье содержит 40% вишни остальную часть варенья составляет сахара Сколько килограммов сахара содержится в 12 кг вишнёвого варенья Помогите пожалуйста!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

6 лет назад