apabila 4 log 3 = a, 3 log 5 = b, maka 4 log 15 =

jawabannya adalah ab

semoga membantu....

4 log 3 = a
3 log 5 = b

4 log 15 = log 15/log 4
= log 5 x 3/ log 4
=3 log 5 + 3 log 3/3 log 4
= b + 1/(1/a)
= a(b+1)
= a(1 + b)