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April 25th, 2011, 07:38 PM   #1
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Log question (need help quick)

Hi everyone :P
i got stuck while i'm trying to solve this question:

Q8 Find a relation between x and y that does not involve logarithms:

b) 2log10(y) - 3log10(x) = 2

<by the way, 10 is the base>



it'll b a great help if anyone can show me the process of solving this question thank you
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April 25th, 2011, 07:41 PM   #2
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Re: Log question (need help quick)

We have:







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April 25th, 2011, 08:14 PM   #3
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Re: Log question (need help quick)

It takes my browser longer to download the webpage than it did for you to reply!
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April 25th, 2011, 08:34 PM   #4
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Re: Log question (need help quick)

I gave no explanations, as it seemed pretty evident what was being done, that's how I was so fast.
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April 26th, 2011, 03:08 PM   #5
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Re: Log question (need help quick)

thank you for your help. as you can see, i'm pretty new to logs
could you help me solve this one as well?

log10(x) = log10(4) / log10(2)

the problem is i don't really get the concept of logs. i've only learnt the 5 basic laws of log and the division of logs is just out of my understanding. could you explain it for me?
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April 26th, 2011, 03:36 PM   #6
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Re: Log question (need help quick)

Surely one of the rules that you know will justify the equality...
log_10(4) = 2*log_10(2)

Then the right hand side is just "2".
Exponentiate. etc.
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