Question

Tìm x

3^x + 3^{x + 2} = 270 

Answer 1

\(\Leftrightarrow3^x=27\)

hay x=3

Answer 2

\(\Leftrightarrow3^x+3^x.3^2=270\Leftrightarrow3^x.10=270\\\Leftrightarrow3^x=3^3\Leftrightarrow x=3\)