Для квадратного уравнения \(\displaystyle x^2+13x+42=0\) вычислите дискриминант

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

и найдите корни уравнения.

\(\displaystyle x_1=\)

[ ]\(\displaystyle +\)[ ]   [ ]

\(\displaystyle =\)

[ ]

 

\(\displaystyle x_2=\)

[ ]\(\displaystyle -\)[ ]   [ ]

\(\displaystyle =\)

[ ]