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13) syarat x dalam log xx > 0
14) jika. log x = p
Log 1000 = 3
(4-p) p = 3
4p-p² = 3
p²-4p+3 = 0
(p-1)(p-3) = 0
p = 1 dan p = 3
Log x = 1
= log 10
x = 10
Log x = 3
= log 1000
x = 1000
x1.x2 = 10 . 1000
= 10000