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nad8361
@nad8361
October 2021
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Решите уравнение:
фото внизу
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nKrynka
Решение
7x + 270 / (x + 6) = 51
[7x*(x + 6) + 270 - 51*(x + 6)] / (x + 6) = 0
7x² + 42x + 270 - 51x - 306 = 0
x + 6 ≠ 0, x ≠ - 6
7x² - 9x - 36 = 0
D = 81 + 4*7*36 = 1089
x₁ = (9 - 33) / 14
x₁ = - 24 / 14
x₁ = - 1 (5/7)
x₂ = (9 + 33)/14
x₂ = 3
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nad8361
а x1 чему равен?
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Answers & Comments
7x + 270 / (x + 6) = 51
[7x*(x + 6) + 270 - 51*(x + 6)] / (x + 6) = 0
7x² + 42x + 270 - 51x - 306 = 0
x + 6 ≠ 0, x ≠ - 6
7x² - 9x - 36 = 0
D = 81 + 4*7*36 = 1089
x₁ = (9 - 33) / 14
x₁ = - 24 / 14
x₁ = - 1 (5/7)
x₂ = (9 + 33)/14
x₂ = 3