Resposta :
[tex]\boxed{\log_{b}{a^n}=n\log_b{a}}[/tex]
[tex]\log_2{256}+\log_3{81}=\log_2{2^8}+\log_3{3^4}=\\\\ 8\log_2{2}+4\log_3{3}=8(1)+4(1)=\boxed{12}[/tex]
[tex]\boxed{\log_{b}{a^n}=n\log_b{a}}[/tex]
[tex]\log_2{256}+\log_3{81}=\log_2{2^8}+\log_3{3^4}=\\\\ 8\log_2{2}+4\log_3{3}=8(1)+4(1)=\boxed{12}[/tex]