Question

\(3^x+3^{x+2}=810\)

Answer 1

\(3^x+3^{x+2}=810\)

\(\Rightarrow3^x\left(1+3^2\right)=810\Rightarrow3^x.10=810\)

\(\Rightarrow3^x=81\Rightarrow x=4\)

Answer 2

\(\Leftrightarrow3^x\cdot10=810\)

hay x=4