Question

3^x-1 =27

Answer 1

\(3^{x-1}\)=27

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

suy ra x-1=3 

x=3+1=4

vậy x=4 k cho mình nha mình k lại

Answer 2

3^x-1=27

=>3^x-1=3³

=>x-1=3

=>x=4

Answer 3

\(3^{x-1}=27\)

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

\(\Rightarrow x-1=3\Rightarrow x=3+1\)

\(\Rightarrow x=4\)