\[x(x + 16) = 0\]
\[x = 0,\ \ x + 16 = 0\]
\[\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x = - 16.\]
\[\sqrt{x} = 2\ \ \]
\[x = 4.\]
\[D = ( - 2)^{2} - 4 \cdot 1 \cdot ( - 24) =\]
\[= 4 + 96 = 100\]
\[x_{1} = \frac{2 + \sqrt{100}}{2} = \frac{2 + 10}{2} =\]
\[= \frac{12}{2} = 6;\]
\[x_{2} = \frac{2 - \sqrt{100}}{2} = \frac{2 - 10}{2} =\]
\[= - \frac{8}{2} = - 4.\]
\[Ответ:x = 0;\ \ x = 6;\ \ x = \pm 4;\ \]
\[x = - 16.\]