\[\left( x^{2} - 16 \right)\sqrt{x + 2} = 0\]
\[x^{2} - 16 = 0\]
\[(x - 4)(x + 4) = 0\]
\[x = 4;\ \ x = - 4.\]
\[\sqrt{x + 2} \geq 0\]
\[x + 2 \geq 0\]
\[x \geq - 2.\]
\[Ответ:x = 4;\ \ x = - 2.\]