SOLUTION: log x - log 4 = -1

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: log x - log 4 = -1      Log On


   

Question 281718: log x - log 4 = -1
Found 2 solutions by stanbon, josmiceli:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
log x - log 4 = -1
---
log(x/4) = -1
x/4 = 10^-1
x = 4/10
x = 2/5
==============
Cheers,
Stan H.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
log%28x%29+-+log%284%29+=+-1
log%28x%2F4%29+=+-1
10%5E%28-1%29+=+x%2F4
1%2F10+=+x%2F4
Multiply both sides by 40
4+=+10x
x+=+2%2F5