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Neумник
@Neумник
July 2022
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решите пожалуйста
4х²+4х+1=0
-х²+7х+8=0
-х²-2х+15=0
5х²-8х+3=0
7х²+9х+2=0
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Nymeria
4х² + 4х + 1 = 0
D = 4
² - 4*4*1 = 16 - 16 = 0
x = -4 ÷ 8 = -0,5
Ответ: х = -0,5
-х² + 7х + 8 = 0 |
×(-1)
x² - 7x - 8 = 0
D = (-7)² -4*(-8) = 49 + 32 = 81
x₁ = (7 + 9) ÷ 2 = 8
x₂ = (7 - 9) ÷ 2 = -1
Ответ: х = 8; х = -1
-х² - 2х + 15 = 0
D = (-2)
² - 4*(-1)*15 = 4 + 60 = 64
x₁ = (2 + 8) ÷ (-2) = -5
x₂ = (2 - 8) ÷ (-2) = 3
Ответ: х = -5; х = 3
5х² - 8х + 3 = 0
D = (-8)
² - 4*5*3 = 64 - 60 = 4
x₁ = (8 + 2) ÷ 10 = 1
x₂ = (8 - 2) ÷ 10 = 0,6
Ответ: х = 1; х = 0,6
7х² + 9х + 2 = 0
D = 9
² - 4*7*2 = 81 - 56 = 25
x₁ = (-9 + 5) ÷ 14 = -2/7
x₂ = (-9 - 5) ÷ 14 = -1
Ответ: x = -2/7; x = -1
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Answers & Comments
D = 4² - 4*4*1 = 16 - 16 = 0
x = -4 ÷ 8 = -0,5
Ответ: х = -0,5
-х² + 7х + 8 = 0 | ×(-1)
x² - 7x - 8 = 0
D = (-7)² -4*(-8) = 49 + 32 = 81
x₁ = (7 + 9) ÷ 2 = 8
x₂ = (7 - 9) ÷ 2 = -1
Ответ: х = 8; х = -1
-х² - 2х + 15 = 0
D = (-2)² - 4*(-1)*15 = 4 + 60 = 64
x₁ = (2 + 8) ÷ (-2) = -5
x₂ = (2 - 8) ÷ (-2) = 3
Ответ: х = -5; х = 3
5х² - 8х + 3 = 0
D = (-8)² - 4*5*3 = 64 - 60 = 4
x₁ = (8 + 2) ÷ 10 = 1
x₂ = (8 - 2) ÷ 10 = 0,6
Ответ: х = 1; х = 0,6
7х² + 9х + 2 = 0
D = 9² - 4*7*2 = 81 - 56 = 25
x₁ = (-9 + 5) ÷ 14 = -2/7
x₂ = (-9 - 5) ÷ 14 = -1
Ответ: x = -2/7; x = -1