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Misal :5'log x = a
5'log² x - 5'log x³ + 2 = 0
5'log² x - 3 . 5'log x + 2 = 0
a² - 3a + 2 = 0
(a - 1)(a - 2) = 0
a = 1 --> 5'log x = 1 ---> x = 5¹ = 5
a = 2 ---> 5'log x = 2 ---> x = 5² = 25
Nilai x yg memenuhi :
x = 5 dan x = 25