Для квадратного уравнения \(\displaystyle -x^2-x+9=0\) вычислите дискриминант

\(\displaystyle {\rm D}=\)[ ]

и найдите корни уравнения.

\(\displaystyle x_1=\)

\(\displaystyle -\Big(\)[ ]\(\displaystyle \Big)+\)[ ]   [ ]

 

\(\displaystyle x_2=\)

\(\displaystyle -\Big(\)[ ]\(\displaystyle \Big)-\)[ ]   [ ]