Question

3^x+3^x+2=810

Answer 1

\(3^x+3^{x+2}=810\Leftrightarrow3^x\left(1+9\right)=810\Leftrightarrow3^x=81\Leftrightarrow x=4\)

Answer 2

phương trình <=> 3^x(1+3^2)=810 <=> 3^x.10=810 <=>3^x=81 <=> x=4

Answer 3

     3^x + 3^x+2      =  810

=> 3^x + 3^x . 3^2 =  810

=> 3^x (1 + 3^2)    =  810

=>      3^x . 10       =  810

=>      3^x              =  81

=>          x              =  4

  Vậy : x = 4