Diketahui 5 log 3 = p. Maka nilai 15 log 81

Logaritma

15log 81
= 5log 81 / 5log 15
= 5log 3³ / 5log (5 x 3)
= (3 . 5log 3) / 5log 5 + 5log3
= (3p) / (p + 1)