Для квадратного уравнения \(\displaystyle -3x^2+21x+54=0\) вычислите дискриминант

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

и найдите корни уравнения.

\(\displaystyle x_1=\)

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

\(\displaystyle =\)

[ ]

 

\(\displaystyle x_2=\)

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

\(\displaystyle =\)

[ ]