diketahui 2log3=a,dan 2log5=b,nilai dari log 15 adalah

²log 3 = a
Log 3 / log 2 = a
Log 3 = a log 2

²log 3 = a maka log 3 = a log 2
²log 5 = b maka log 5 = b log 2

Log 15
= log 5 × 3
= log 5 + log 3
= a log 2 + b log 2
= log 2 (a + b)

2log 15 = 2log (3x5) = 2log 3 + 2log 5 = a+b