Question

3^1-x -3^x=2 Помогите!!

Answer 1

$3^{1-x}-3^x=2 \\ 3^x=t \\ \frac{3}{t}-t=2\\ 3-t^2-2t=0 \\ (1-t)(t+3)=0 \\\\ t=1 \\3^x=1;3^x=3^0;x=0$