\[ax^{2} + 8x - a + 10 > 0\]
\[\left\{ \begin{matrix} a > 0 \\ D < 0 \\ \end{matrix} \right.\ \]
\[D = 64 - 4a( - a + 10) =\]
\[= 64 + 4a^{2} - 40a < 0\]
\[4a^{2} - 40a + 64 = 0\ \ \ |\ :4\]
\[a^{2} - 10a + 16 = 0\]
\[a_{1} + a_{2} = 10,\ \ a_{1} \cdot a_{2} = 16\]
\[a_{1} = 2,\ \ a_{2} = 8\]
\[Ответ:(2;8).\]