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bekzataish2004
@bekzataish2004
June 2022
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найдите корень уравнения 1) x^3-(x-3)(x^2+3x+9)+9x=-18x
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Universalka
Verified answer
X³ - (x - 3)(x² + 3x +9) + 9x = -18x
x³ - (x³ + 3x² + 9x - 3x² - 9x - 27) +9x +18x = 0
x³ - (x³ - 27) + 27x = 0
x³ - x³ + 27 + 27x = 0
27(x + 1) = 0
x + 1 = 0
x = -1.
Ответ: x = -1.
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Answers & Comments
Verified answer
X³ - (x - 3)(x² + 3x +9) + 9x = -18xx³ - (x³ + 3x² + 9x - 3x² - 9x - 27) +9x +18x = 0
x³ - (x³ - 27) + 27x = 0
x³ - x³ + 27 + 27x = 0
27(x + 1) = 0
x + 1 = 0
x = -1.
Ответ: x = -1.