0\\\\3^{x}=m,m>0\\\\m^{2}-7m-18>0\\\\(m-9)(m+2)>0" alt="3^{2x} -7*3^{x}-18>0\\\\3^{x}=m,m>0\\\\m^{2}-7m-18>0\\\\(m-9)(m+2)>0" align="absmiddle" class="latex-formula">
+ - +
______₀________₀_______m
- 2 9
m < - 2 - решений нет
m > 9
3^x > 9
3^x > 3²
x > 2
Ответ : x ∈ (2 ; + ∞)