Question

решите уравнения
(3^x-1)-(3^x) +( 3^x+1)=63

Answer 1

$3^{x-1}-3^x+3^{x+1}=63 \ 3^{-1}cdot 3^x-3^x+3cdot3^x=63|cdot3 \ 3^x-3cdot3^x+9cdot3^x=63 \ 7cdot3^x=63 \ 3^x=63:7 \ 3^x=9 \ 3^x=3^2 \ x=2$