Question

3^x -1+5 nhân 3^x -1=162

Answer 1

\(3^{x-1}+5.3^{x-1}=162\)

\(3^{x-1}.1+5.3^{x-1}=162\)

\(3^{x-1}.\left(1+5\right)=162\)

\(3^{x-1}.6=162\)

\(3^{x-1}=162:6\)

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

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

\(\Rightarrow x-1=3\)

\(x=3+1\)

\(x=4\)

Vậy \(x=4\)

Answer 2

Ý bạn là \(\left(3^x-1+5\right)\left(3^x-1\right)\)

Hay \(\left(3^{x-1}+5\right)\left(3^{x-1}\right)\)

Answer 3

\(3^{x-1+5}\) hay là \(3^{x-1}+5\) hay là \(3^x-1+5\) thế bạn