Question

Jika 2 log 3=a, 5 log 2 = b maka 15 log 12 =............

Answer 1

2'log 3 = a
5'log 2 = b
15'log 12 = ²log 12 / ²log 15
              = (²log 2² x 3) / (²log 3 x 5)
              = (2 ²log 2 + ²log 3) / (²log 3 + ²log 5)
              = (2(1) + a) / (a + 1/b)
              = (2b + ab) / (ab + 1)