Question

решите уравнение$9^{x+1}+ 3^{2x+4}=30$

Answer 1

$3^{2(x+1)}+3^{2x+4}=30 \ 3^{2x+2}+3^{2x+4}=30 \ 3^{2x}*(9+ 81)=30 \ 3^{2x} *90=30 \ 3^{2x} =3^{-1} \ 2x=-1 \ x=-0,5$