Ta có: \(\sqrt{9\left(5x^2-2x+16\right)}=3x+12\)
\(\Leftrightarrow9\left(5x^2-2x+16\right)=9x^2+72x+144\)
\(\Leftrightarrow36x^2-90x=0\)
\(\Leftrightarrow18x\left(2x-5\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=\dfrac{5}{2}\end{matrix}\right.\)