logarithm help

bearfan2013

New member
Joined
Feb 11, 2012
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1
need help with a problem or two.

log[3] 3r-1=3 know the answer is 27, but cannot seem to put the steps together to get there. Is it as easy as log[3] 3r=4 and you take the 3 from the log to the fourth power to get 81? thus 3r=81 and r=27?
 
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