\[P\left( - \frac{1}{2} \right) =\]
\[= a \bullet \left( - \frac{1}{2} \right)^{4} + b \bullet \left( - \frac{1}{2} \right)^{2} + c =\]
\[= \frac{1}{16}a + \frac{1}{4}b + c\]
\[\frac{1}{16}a + \frac{1}{4}b + c = - 1\ \ \ \ | \bullet 16\]
\[a + 4b + 16c = - 16\]
\[Ответ:\ - 16.\]