Question

log(x-1)+log3(2x+1)-log(x-9)=3
qual e a resposta desse logaritmo ?

Answer 1

 log3(3x) - log9(x) - log3(x) = 2 
log3(3) + log3(x) - log9(x) - log3(x) = 2 
1 - log9(x) = 2 
log9(x) = -1 
x = 1/9 
3x = 1/3 
log1/3(3x) = log1/3(1/3) = 1 


log(2x+7) = log(2x) + log(7) 
log(2x+7) - log(2x) = log(7) 
log( (2x+7)/2x ) = log(7) 
(2x+7)/2x = 7 
2x+7 = 14x 
12x = 7 
x = 7/12 = 0,58333...