Question

Answer 1

\(3^{x-1}+3^0=82\\ \Rightarrow3^{x-1}+1=82\\ \Rightarrow3^{x-1}=81\\ \Rightarrow3^{x-1}=3^4\\ \Rightarrow x-1=4\\ \Rightarrow x=5\)

Answer 2

\(3^{x-1}+1=82\Leftrightarrow3^{x-1}=81=3^4\Rightarrow x-1=4\Leftrightarrow x=5\)

Answer 3

\(3^{x-1}+1=3^4+1\)

\(\Leftrightarrow3^{x-1}=3^4\)

\(\Leftrightarrow x-1=4\)

\(x=5\)

Answer 4

\(\Leftrightarrow3^{x-1}=81\)

=>x-1=4

hay x=5