Question

Resolva a questao dessa imagem

Answer 1

$81^3.9^{-2}=3^x$

$(3^4)^3.(3^2)^{-2}=3^x$

$3^{12}.3^{-4}=3^x$

$3^{12-4}=3^x$

$3^8=3^x$

$x=8$