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Verified answer
²log (5x + 9) = 2²log (5x + 9) = ²log 4
Maka
5x + 9 = 4
5x = 4 - 9
5x = -5
x = -1
Syarat logaritma,
5x + 9 > 0
5x > -9
x > ⁻⁹/₅
HP : { -1 }
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