Решите уравнение: 5-x^2=1-x(x+8).

\[5 - x^{2} = 1 - x(x + 8)\]

\[5 - x^{2} = 1 - x^{2} - 8x\]

\[- 8x = 5 - 1\]

\[- 8x = 4\]

\[x = - \frac{4}{8} = - \frac{1}{2}\]

\[x = - 0,5.\]