Question

Найдите корень уравнения.
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Answer 1

${x}^{3} - {9x}^{2} + x - 9 = 0 \\ {x}^{2} (x - 9) + (x - 9) = 0 \\( x - 9)( {x}^{2} + 1) = 0 \\ x - 9 = 0 \\ x = 9$