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Doshd
@Doshd
July 2022
2
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решите пожалуйста алгебру
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salnik1909p5sg3s
Ответ:......................
1 votes
Thanks 1
zinaidazina
В третьем минус.
salnik1909p5sg3s
Согласен...... потерял)
zinaidazina
1.
2.
2х(х-2) = (х+1)² - 9
2х² - 4х = х² + 2х + 1 - 9
2х² - 4х - х² - 2х - 1 + 9 = 0
х² - 6х + 8 = 0
D = b² - 4ac
D = 36 - 4·1·8 = 36 - 32 = 4
√D = √4 = 2
x₁ = (6 + 2)/2 = 8/2 = 4
x₁ = 4
x₂ = (6-2)/2 = 4/2= 2
x₂ = 2
Ответ: { 2; 4)
3.
(-6x-8)·4 ≤ (3 + 5х) · 3
- 24х - 32 ≤ 9 + 15х
- 24х - 15х ≤ 9 + 32
-39х≤ 41
39х≥ - 41
х ≥ - 41/39
Ответ: х∈ [-41/39; + ∞)
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Answers & Comments
2.
2х(х-2) = (х+1)² - 9
2х² - 4х = х² + 2х + 1 - 9
2х² - 4х - х² - 2х - 1 + 9 = 0
х² - 6х + 8 = 0
D = b² - 4ac
D = 36 - 4·1·8 = 36 - 32 = 4
√D = √4 = 2
x₁ = (6 + 2)/2 = 8/2 = 4
x₁ = 4
x₂ = (6-2)/2 = 4/2= 2
x₂ = 2
Ответ: { 2; 4)
3.
(-6x-8)·4 ≤ (3 + 5х) · 3
- 24х - 32 ≤ 9 + 15х
- 24х - 15х ≤ 9 + 32
-39х≤ 41
39х≥ - 41
х ≥ - 41/39
Ответ: х∈ [-41/39; + ∞)