Question

\(3^x+3^{x+1}=324\)

Tìm X, biết

Answer 1

\(3^x+3^x.3=324\)

\(3^x.\left(1+3\right)=324\)

\(3^x.4=324\)

\(3^x=324:4\)

\(3^x=81\)

\(3^x=3^4\)

\(\Rightarrow x=4\)

Answer 2

3^x + 3^x+1     = 324

3^x .1+ 3^x.3   = 324

 3^x.(1+3)      = 324

    3^x .4        = 324

     3^x           = 324:4

     3^x            = 81

 81=3 .3.3.3 =3⁴ => 81 =3⁴=> x =4

Vậy x=4

   

Answer 3

ta co :3^x+3^x+1=324

=>3^x+3^x.3=324

=>3^x.(1+3)=324

=>3^x=324/4=81=3^4

=>x=4

vay x=4