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marketa · Jan 27, 2012, 02:18 PM

I have jut this and I don't know how to continue --> log(2x 10)/log100 = log (x 1) -->then 100^2x 10 = x 1 a that is where a ended :/ please help the result should be 3. Thanks everyone ;)

marketa · Jan 27, 2012, 02:21 PM

sorry there should be log(2x plus 10)/2 = log(X plus 1)

Aurora2000 · Jan 28, 2012, 03:19 AM

Just eliminate the log (by applying its inverse function exp):

$\log (2x+10)/2=\log(x+1)$
$\log (2x+10)=2\log(x+1)=\log(x+1)^2$
and then
$2x+10=(x+1)^2$

Obviously you need x>-1 or the first line does not make sense.