\(3^{x+2}-3^{2-x}>24\)
\(\Leftrightarrow9.3^x-9.3^{-x}>24\)
Đặt \(3^x=t>0\)
\(\Rightarrow9t-\dfrac{9}{t}>24\)
\(\Leftrightarrow3t^2-8t-3>0\)
\(\Leftrightarrow\left(t-3\right)\left(3t+1\right)>0\)
\(\Leftrightarrow t>3\)
\(\Rightarrow3^x>3\)
\(\Rightarrow x>1\)