Question

Решите уравнение : 9х -3^х+1=54 .

Answer 1

$3^{2x}-3^x*3=54 \\ 3^x=t \\ t^2-3t-54=0 \\ t_1=-6 \\ t_2=9 \\ \left \{ {{3^x=-6} \atop {3^x=9}} \right. \\ x=2$