Math Is Fun Forum

esatpllana

Member

Registered: 2007-11-22

Posts: 12

need hep with this Logarithm

log (base 3 and number x) + log( base 2 , number x) = 2
i need help with this logarithm

Last edited by esatpllana (2008-03-12 09:27:34)

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Daniel123

Member

Registered: 2007-05-23

Posts: 663

Re: need hep with this Logarithm

In order to get a base in LaTeX, use 'log_3' etc.

Are you familiar with

?

Using this,

If you have a nice fancy calculator that can calculate logs to different bases then you're fine.. if not then use the rule I stated at the top to change things around to a base you can enter into your calculator.

The answer is 2.339652691

Last edited by Daniel123 (2008-03-12 08:28:09)

esatpllana

Member

Registered: 2007-11-22

Posts: 12

Re: need hep with this Logarithm

thanks for your answer Daniel
but I can't understand completly can you  comment this problem
see you

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Daniel123

Member

Registered: 2007-05-23

Posts: 663

Re: need hep with this Logarithm

What part do you have a problem with?

My first step was to change the base of one of the logarithims so that I was working with the same base throughout.

I then multiplied through by

I then factorised to isolate the terms containing x (whilst simplifying the log on the right hand side)

I then divided through by the factor

I then converted the expression back into exponent form in order to solve for x.

I then simplified.

Last edited by Daniel123 (2008-03-12 08:42:54)

esatpllana

Member

Registered: 2007-11-22

Posts: 12

Re: need hep with this Logarithm

thanks now i understand thanx
bye
regards

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Mitrovica My City
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