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Property 3

If m = log 20...

Question

If $m = l o g 20$ and $n = l o g 25$ , find the value of x, so that : $2 l o g (x - 4) = 2 m - n$ .

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Solution

m=log 20 and n=log 25
2log=2m-n
2log=2log 20-log 25
log=log-log25
log=log
=
x-4=4
x=8

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