Question

logarítmo2 8   e logaritmo3 81 calcular?

Answer 1

$log_{2} 8= log_{2} 2^{3} =3. log_{2} 2=3.1=3$

$log_{3} 81= log_{3} 3^{4} =4. log_{3} 3=4.1=4$

Answer 2

log  8 = x ==> 2^x = 8 ==> 2^x = 2^3 ==> x = 3
    2

log  81 = x  ==> 3^x = 81 ==> 3^x = 3^4 ==> x = 4
     3