January 8th, 2017, 01:00 PM  #1 
Member Joined: Nov 2016 From: Ireland Posts: 54 Thanks: 2  Bogged in logs
I'm fairly familiar with logs  or so I thought. There's something tripping me up here though. Perhaps its the algebra. Something... anyways $\displaystyle log_4 x  log_4 (x1) = 2 $ I've got it to $\displaystyle log_4 x/x1 = 2$ Think I'm messing something up after that. I've tried transferring the power across $\displaystyle 4^2$ and working at it like that. Keep coming back with 0.6...... or even 0.6.... when I substitute the answer back in. I'm a lil burned out at this stage think I'm messing up the algebra. 
January 8th, 2017, 01:08 PM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,215 Thanks: 1056 
First, note that $x > 1$ $\log_4\left(\dfrac{x}{x1}\right)=2$ $4^2 = \dfrac{x}{x1}$ $16(x1)=x$ $16x16=x$ $15x=16$ $x=\dfrac{16}{15} >1$ 
January 8th, 2017, 01:19 PM  #3 
Member Joined: Nov 2016 From: Ireland Posts: 54 Thanks: 2 
Dang couldn't see the wood for the trees. Why it always look so simple when you guys do it? It's like watching pro golf. Anybody fancy lending me their brain for a day? Give you a good price for it. Sigh... thanks again Skeeter 

Tags 
bogged, logs 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
logs  markosheehan  Algebra  1  December 14th, 2016 10:52 AM 
Logs  evaeva  Calculus  1  April 11th, 2014 12:03 AM 
Having some problems understanding logs (natural logs)  leo255  Algebra  4  January 26th, 2014 09:49 AM 
Help on solving problems with logs and natural logs!  rokr32  Algebra  1  February 1st, 2012 04:13 PM 