5log(x-25) = 5log(x+5) - 3log 3

Bab Logaritma
Matematika SMA Kelas X

^ = pangkat

^5log (x - 25) = ^5log (x + 5) - ^3log 3
^5log (x - 25) = ^5log (x + 5) - 1
^5log (x - 25) = ^5log (x + 5) - ^5log 5
x - 25 = (x + 5)/5
5 (x - 25) = x + 5
5x - 125 = x + 5
5x - x = 5 + 125
4x = 130
x = 32,5

syarat
x - 25 > 0
x > 25

jadi. x = 32,5