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log (x²)(8x) = log 10
8x³ = 10
x³ = 10/8 = 5/4
x = ∛(5/4)
c. ³log 2. ²log 3. ³log x = 729
³log x = 729
x= 3⁷²⁹
d) ²log (x+6) = 2. ²log x
²log (x+6) = ²log x²
x+6 = x² , dengan batas x > 0
x² -x - 6 = 0
(x -3)(x+2) =0
x = 3 atau x = - 2, batas x > 0
x = 3