\[y = \frac{x^{4} - 20x^{2} + 64}{(x - 2)(x + 4)} =\]
\[= \frac{(x + 4)(x - 4)(x + 2)(x - 2)}{(x - 2)(x + 4)} =\]
\[= (x - 4)(x + 2) = x^{2} - 4x + 2x - 8 =\]
\[= x^{2} - 2x - 8.\]
\[x^{4} - 20x^{2} + 64 =\]
\[= (x + 4)(x - 4)(x + 2)(x - 2)\]
\[x_{1}^{2} + x_{2}^{2} = 20;\ \ x_{1}^{2} \cdot x_{2}^{2} = 64\]
\[x_{1}^{2} = 16;\ \ \ x_{2}^{2} = 4.\]
\[y = x^{2} - 2x - 8;\ \ \ x \neq 2;\ \ x \neq - 4:\]
\[Прямая\ y = p\ имеет\ с\ графиком\ ровно\]
\[одну\ общую\ точку\ при:\]
\[p = 16;\ \]
\[p = - 8;\]
\[p = - 9.\]
\[Ответ:\ - 9;\ - 8;16.\]