3. Tentukan nilai-nilai x dari setiap persamaan logaritma berikut.
b. (5x)log 5x = log 10000
Jawaban :
(5x)log 5x = log 10000
(5x)log 5x = log 104
(5x)log 5x = 4 log 10
(5x)log 5x = 4
berikan log di kedua ruas
log (5x)log 5x = log 4
log 5x . log 5x = log 4
log2 5x = log 4
log 5x = (log 4)l/2
5x = 10(log 4)^1/2
x = 10(log 4)^1/2 /5
No comments:
Post a Comment