diketahui 5 log 3 = A dan 3 log 4 = b nilai 4 log 15 adalah

5'log 3 = a
3'log 4 = b
3'log 2 = b/2

5'log 3 . 3'log 2 = 5'log 2 = ab/2

4'log 15
= 1/2 . 2'log (3 × 5)
= 1/2 (2'log 3 + 2'log 5)
= 1/2 (2/b + 2/ab)
= 1/b + 1/ab
= (a + 1)/ab ✔