Найти х -5=3х^2+6х-2
3x^2 + 6x - 2 = - 5 3x^2 + 6x + 3 = 0 /:3 x^2 + 2x + 1 =0 D = 4 - 4 = 0 (x + 1)^2 = 0 x + 1 = 0 x = - 1