y = x⁴ - 8x² - 9
x⁴ - 8x² - 9 = 0
Сделаем замену : x² = m , m ≥ 0
m² - 8m - 9 = 0
m₁ = 9 m₂ = - 1 < 0 - не уд .
x² = 9
x₁ = - 3 x₂ = 3
Ответ : - 3 ; 3
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y = x⁴ - 8x² - 9
x⁴ - 8x² - 9 = 0
Сделаем замену : x² = m , m ≥ 0
m² - 8m - 9 = 0
m₁ = 9 m₂ = - 1 < 0 - не уд .
x² = 9
x₁ = - 3 x₂ = 3
Ответ : - 3 ; 3
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