Question

se log (5x) - 4.log5 =-3 então x e igaul a:

Answer 1

log(5x)-4log5=-3
log(5x)-log(5^4)=-3
log(5x/5^4)=-3

10^-3=(5x/5^4)
(5^4).(10^-3)=5x
(5^4)/10³=5x
x=(5^4)/10³.5
x=5³/10³
x=(5/10)³
x=(1/2)³
x=1/2³
x=1/8