jika 8 log 5=a tentukan nilai! 4 log 1/5

Bab Logaritma
Matematika SMA Kelas X

⁸log 5 = a
^(2³)log 5 = a
(1/3) . ²log 5
²log 5 = 3 x a
²log 5 = 3a

⁴log (1/5) = ^(2²)log (5⁻¹)
                = (-1/2) . ²log 5
                = (-1/2) . 3a
                = -3a/2 

4 log 1/5
= 8^2/3 log 5^-1
= -3/2 8log5
= -3/2 a