diketahui 2log 3 = a dan 2 log 5 = b. nilai 3 log 20

2log 3 = a dan 2log 5 = b
3log 20 = log 20 / log 3
= (log 4 x 5) log 3
= (log 2^2 + log 5) / log 3
= ( 2.log 2 + log 5) / log 3 (ganti bilangan pokok logariitma dengan 2)
= ( 2. 2log 2 + 2log 5) / 2log 3
= ( 2 + b ) / a

³log20
= (²log20) / (²log3)
= (²log(4x5)) / (²log3)
= (²log4 + ²log5) / (²log3)
= (2 + b)/a