Algebra help!! please!!

which expression is the same as log[5][5(x-4)]
a) log[8]5x-log[8]20
b) 5 log[8](x-4)
c) log[8]x
d) log[8] 5+log[8](x-4)
will vote for best answer!!

log mn = log m + logn
So we have log5 + log(x-4) <-- answer d

I'm assuming you mean log[8](5(x-4)), if so the answer is a) because log(a-b) = log(a)-log(b), so

log[8](5(x-4)) = log[8](5x - 20) = log[8](5x) - log[8](20)