Răspunsuri

Cel mai inteligent răspuns!
2014-06-05T10:45:25+03:00
Log log_{6} (x^{2}+x) = log_{2}x  \\ 
 \frac{log _{2}x(x+1) }{ log_{2}6} = log_{2}x  \\ 
 log_{2}x + log_{2}(x+1)=  log_{2}x(log_{2}3+log_{2}2) \\
log_{2}x + log_{2}(x+1)=log_{2}3x+log_{2}x \\
log_{2}(x+1)=log_{2}3x  => \\
x+1=3x \\
2x=1\\
x= \frac{1}{2} 

\\ 
\\
c.e.:
x > 0;(1)
x(x+1) > 0;(2)
din (1), (2) => x > 1
nu sunt foarte sigura dar cam asa se face
2 3 2