2. Selesaikan setiap persamaan logaritma di bawah ini.
a. x1 + xlog 16 = 4x2
Jawaban :
x1 + xlog 16 = 4x2
tambahkan log di kedua ruas
log x1 + xlog 16 = log (4x2)
(1 + xlog 16) . log x = log (2x)2
log x + log x . xlog 16 = 2 log 2x
log x + log 16 = 2 log 2x
log (16x) = 2 log 2x
log (8 . 2x) = 2 log 2x
log 8 + log 2x = 2 log 2x
log 8 = 2 log 2x - log 2x
log 8 = log 2x
8 = 2x
x = 8/2
x = 4
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