см. вложение
=========================================
3X^2 - 13X - 4 < _ 0
D = 169 - 4*3*(-4) = 169 + 48 = 217
V 217 = 14.73
X1 = 13 + 14.73 \ 6 = 4.6216
X2 = 13 - 14.73 \ 6 = 0.2883
>
0.29 4.6
ответ: X1 < _ 0.29
X2 < _ 4.6
см. вложение
=========================================
3X^2 - 13X - 4 < _ 0
D = 169 - 4*3*(-4) = 169 + 48 = 217
V 217 = 14.73
X1 = 13 + 14.73 \ 6 = 4.6216
X2 = 13 - 14.73 \ 6 = 0.2883
>
0.29 4.6
ответ: X1 < _ 0.29
X2 < _ 4.6