b₁ = x + 1 b₂ = x - 1 b₃ = 3x + 1
По свойству геометрической прогрессии :
b₂² = b₁ * b₃
(x - 1)² = (x + 1)(3x + 1)
x² - 2x + 1 = 3x² + x + 3x + 1
x² - 2x - 3x² - 4x = 0
- 2x² - 6x = 0
x² + 3x = 0
x(x + 3) = 0
или x₁ = 0 или x + 3 = 0 и тогда x₂ = - 3
1) 0+ 1 = 1
0 - 1 = - 1
3 * 0 + 1 = 1
÷ 1 ; - 1 ; 1
2) - 3 + 1 = - 2
- 3 - 1 = - 4
3 * (- 3) + 1 = - 9 + 1 = - 8
÷ - 2 ; - 4 ; - 8
Ответ : При x = 0 и x = - 3
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Verified answer
b₁ = x + 1 b₂ = x - 1 b₃ = 3x + 1
По свойству геометрической прогрессии :
b₂² = b₁ * b₃
(x - 1)² = (x + 1)(3x + 1)
x² - 2x + 1 = 3x² + x + 3x + 1
x² - 2x - 3x² - 4x = 0
- 2x² - 6x = 0
x² + 3x = 0
x(x + 3) = 0
или x₁ = 0 или x + 3 = 0 и тогда x₂ = - 3
1) 0+ 1 = 1
0 - 1 = - 1
3 * 0 + 1 = 1
÷ 1 ; - 1 ; 1
2) - 3 + 1 = - 2
- 3 - 1 = - 4
3 * (- 3) + 1 = - 9 + 1 = - 8
÷ - 2 ; - 4 ; - 8
Ответ : При x = 0 и x = - 3