\[\left( x^{2} - 25 \right)\sqrt{x + 3} = 0\]
\[x^{2} - 25 = 0\]
\[x^{2} = 25\]
\[x = \pm 5.\]
\[x + 3 \geq 0\]
\[x \geq - 3\]
\[Ответ:x = - 3;\ \ x = 5.\ \]