Log²снизу5(x-1)-log снизу 5(x-1)³=-2
Log₅²(x - 1) - log₅²(x - 1)³ = - 2 log₅²(x - 1) - 3log₅²(x - 1) + 2 = 0 t = log₅(x - 1) t² - 3t + 2 = 0 D = 9 - 8 = 1 t₁ = 0.5(3 - 1) = 1 t₂ = 0.5(3 + 1) = 2 log₅(x - 1) = 1 ---> x - 1 = 5 ---> x₁ = 6 log₅(x - 1) = 2 ---> x - 1 = 25 ---> x₂ = 26