Ответы на вопрос:
9х⁴ - 85х² + 36 = 0 замена : х² = n 9n² - 85n + 36 = 0 d = (-85)² - 4*9*36 = 7225 - 1296 = 5929 = 77² d> 0 n₁ = ( - ( - 85) - 77)/(2*9) = (85 - 77)/18 = 8/18 = 4/9 n₂ = ( - ( - 85) + 77)/(2*9) = (85 + 77)/18 = 162/18 = 9 x² = 4/9 x² - 4/9 = 0 x² - (2/3)² = 0 (x - 2/3)(x + 2/3) = 0 x - 2/3 = 0 x₁ = 2/3 x + 2/3 = 0 x₂ = - 2/3 x² = 9 x - 9 = 0 x² - 3² = 0 (x - 3)(x + 3) = 0 x - 3 =0 x₁ = 3 x + 3 = 0 x₂ = - 3ответ : х₁ = - 3 ; х₂ = - 2/3 ; х₃ = 2/3 ; х₄ = 3 .
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