Ответы: 1
Bozhena Oreshkina
2017-10-01 01:39
X + 4x + 12 = 9 x + 4x + 12 — 9 = 0 x + 4x + 3 = 0 D = 4 — 4*1*3 = 16 — 12 = 4 X1,2 = (- 4 + — √4)/2 = (- 4 + — 2)/2 X1 = (- 4 + 2)/2 = — 1 X2 = (- 4 — 2)/2 = — 3