a = 0.64, b = 2, c = -2.5
D = b^2 - 4acD = 2^2 - 40.64(-2.5)D = 4 + 10D = 14
a = -5, b = 2, c = -2.5
D = b^2 - 4acD = 2^2 - 4(-5)(-2.5)D = 4 - 50D = -46
a = 0.64, b = 2, c = -2.5
D = b^2 - 4ac
Для уравнения -5x^2 + 2x - 2.5 = 0:D = 2^2 - 40.64(-2.5)
D = 4 + 10
D = 14
a = -5, b = 2, c = -2.5
D = b^2 - 4ac
D = 2^2 - 4(-5)(-2.5)
D = 4 - 50
D = -46