Найдите нули функции y= x2 – 2x – 15.
X^2 - 2x - 15 = 0 D = 4 + 4*15 = 64 x1 = ( 2 + 8)/2 = 10/2 = 5 x2 = (2 - 8)/2 = - 6/2 = - 3