Monday, May 13, 2013

solve this equation: 3^(x+1) - 3^x = 8

here goes... 


%0D%0A+3%5Ex%2B1+-+3%5Ex+=++3%5Ex%283-1%29=2%2A3%5Ex+%0D%0A 

So we can rewrite as: 


%0D%0A2%2A3%5Ex+=8%0D%0A 


%0D%0A3%5Ex=4%0D%0A 


%0D%0Alog%283%5Ex%29=log%284%29%0D%0A 

xlog%283%29=log%284%29%0D%0A 

x=log%284%29%2Flog%283%29 


:)
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