Смотри..........................
D = b^2 - 4ac
D = (-6)^2 - 4•9•(-1) = 36 + 36 = 72
x1 = ( -b +√D) /2a = (6 + 8.5)/2•9 = 14.5/18 = 0.81
x2 = (-b - √D)/ 2a = (6-8.5)/18 = -2.5/18= -0.14
Смотри..........................
D = b^2 - 4ac
D = (-6)^2 - 4•9•(-1) = 36 + 36 = 72
x1 = ( -b +√D) /2a = (6 + 8.5)/2•9 = 14.5/18 = 0.81
x2 = (-b - √D)/ 2a = (6-8.5)/18 = -2.5/18= -0.14