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a. f(x) = ²log x
0 = ²log x
x = 2°
x = 1
b. f(x) = ⁶log(5x-4)
0 = ⁶log(5x-4)
5x-4 = 6°
5x-4 = 1
5x = 1+4
5x = 5
x = 1
c. f(x) = ¹/³ log(x²-24)
0 = ¹/³ log(x²-24)
x²-24 = (1/3)°
x²-24 = 1
x²-24-1 = 0
x²-25 = 0
(x-5)(x+5) = 0
x = 5 atau x = -5