Предмет: Математика, автор: lehasoldatow

решите уравнение пожалуйста!!!
log₂(4x²+30x)=4

Ответы

Автор ответа: DariosI

0

log₂(4x²+30x)=4
4x²+30x=2⁴
4x²+30x=16
4x²+30x-16=0
2x²+15x-8=0
D=15²+4*2*8=289=17²
x=(15-17)/(2*2)=-1/2
x=(15+17)/(2*2)=8

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Русский язык, автор: sabinamugallimova14

у костра звучала тихая песня определи части речи

7 лет назад

Предмет: Математика, автор: Аноним

3. Упростите выражение : 5/17 * 9/7 * 7/9 * 12/13 * 13/12 * 17/10

7 лет назад

Предмет: Английский язык, автор: XxXOgonekXxX

ПОМОГИ У МЕНЯ СОЧ ПЛИЗЗЗЗЗ
ДАЮ 20 БАЛЛОВ
Task 1.
Reading.
The old dog
The farmer had a dog. When the dog was old, the farmer thought: “The dog is very old. I don’t want to give him food – he can’t work well.”
So he drove the dog out. Poor dog! He walked and walked and walked. He was very hungry. In the evening, he saw a wolf. The wolf said:” What’s the matter with you? You look terrible!”
“I haven’t got a home now. The farmer doesn’t want me. I’m very old now. I can’t work much now and he doesn’t want to feed me. I’m hungry.”
“I know how to help you”, said the wolf.
In the morning, the farmer went to work in the field. He took his little son with him. He put his son down and started working. The wolf ran up to the boy, took him and ran away with him.
When the farmer saw it, he ran after the wolf. But he couldn’t get his son back. Then the dog ran after the wolf. The dog took the boy away from the wolf and brought the little boy to his father. The farmer was very happy. He thanked the dog and said: “Excuse me, please! You are a very good friend. Come back and live with us.”
The old dog was very happy!
Task
True or false?
1. The dog was young.
2. The dog can’t work very well.
3. He took his little daughter with him.
4. The farmer wasn’t glad to see his child.
5. The wolf ate the farmer’s son.
6. The wolf helped the dog.

7 лет назад

Предмет: Информатика, автор: asya38ru

какова максимальная разрядность современных процессоров?

10 лет назад

Предмет: Математика, автор: Danil1247

переведите дроби к наименьшему общему знаменателю 5/9 и 7/18, 9/14 и 6/7, 1/5 и 7/25, 1/2 и 1/3, 2/5 и 3/7, 5/8 и 1/6, спасибо зарание )

10 лет назад