Question

Jika a = 3 log 4
Jika b = 3 log 5
X = 8 log 20

Maka nilai x?

Answer 1

a = ³㏒ 4      ; b = ³㏒ 5
a = 2.³㏒ 2
1/2.a = ³㏒2

x = ^8 log 20 
   = ㏒ 20 / ㏒ 8
   = ㏒ (4 . 5) / ㏒ 2³
   = (㏒ 4 + ㏒ 5) / 3.㏒ 2     ..... beri bil pkok 3
   = (³㏒ 4 + ³㏒ 5) / 3.³㏒2
   = (a + b) / (3 .1/2 a)
   = (a + b) . 2/(3a)
   = 2(a + b) / 3a