Question

a número 2 gente pfv (:

Answer 1

$\boxed{ \frac{3^{x+1}-3^x}{3^{x-1}} = \frac{3^x*3-3^x}{ \frac{3^x}{3} } = \frac{3^x*(3-1)}{ \frac{3^x}{3} } = 3^x*2* \frac{3}{3^x} = 2*3 = 6 }\to B$

Espero ter ajudado. :))

Answer 2

$\frac{3^{x+1}-3^x}{3^{x-1}}~ \Rightarrow~ \frac{3^{x+1}}{3^{x-1}} - \frac{3^x}{3^{x-1}} ~ \Rightarrow~\\\\~ \Rightarrow~3^{x+1-x+1}-3^{x-x+1}~ \Rightarrow~3^2-3^1~ \Rightarrow~\\\\~ \Rightarrow~9-3= \boxed{6}$