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http://prntscr.com/mog8lh

 Feb 22, 2019
 #1
avatar+19686 
+2

Look at log base 10      log 1000 = 3       10^(log1000) = 10^3 = 1000

now put in logbase 7    Log7  x =  y  

                                          which means   7^y  = x

                                                                       then  7^log7 x  = 7^y    which would equal  x

 Feb 22, 2019
 #2
avatar+104627 
+2

This uses the log property that says

 

log a b     =   b

 

So 

 

log 7 x   =   x       

 

 

cool cool cool

 Feb 22, 2019

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