Question

7 ЗАДАНИЕ ПОЖАЛУЙСТА!!!

Answer 1

x⁴ - 9x² + 20 = 0

t² - 9t + 20 = 0

t = 5

t = 4

x = 5

x² = 4

x = $-\sqrt{5}$

x = $\sqrt{5}$

x = -2

x = 2

x₁ = $-\sqrt{5}$

x₂ = -2

x₃ = 2

x₄ = $\sqrt{5}$