document.write( "Question 24059: PLEASE HELP ME SOLVE THIS PROBLEM.
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Algebra.Com's Answer #12826 by kev82(151)\"\" \"About 
You can put this solution on YOUR website!

Sorry, about the slightly messy notation, but I'm still trying to figure out how to use this thing.

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Ok, I assume the thing that's making it tricky for you is the rather nastly looking \"lg%5Bx%5D\". When I first saw this problem I thought eugh! What on earth am I going to do with that. I then remembered somebody's (probably not) famous theorem.

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Logs of different bases differ by a multiplicitive constant!

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Let me demonstrate this with an example, say we wanted to solve \"14%5Ex=29.6\". I'm sure you could tell me straight away that the answer is \"x=lg%5B14%5D%2829.6%29\". But let's try and work out the answer another way. Lets take \"lg%5B10%5D\" of both sides of the equation.

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Applying one of the many \"laws of logs\"

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And finally dividing

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So, we've solved for \"x\" in two different ways, and thus we have worked out that

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Now if you can do the same thing and turn the nasty \"lg%5Bx%5D\" into a much nicer \"lg%5B3%5D\" you should be able to do the problem.

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There is another possibly tricky bit, but see how you get on. please write back if you didn't follow that, or you get stuck further on.

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Hope that helps

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Kev

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