I hope this helps you
-x2 - 2x + 15 = 0
D = (-2)квадрат - 4 * (-1) * 15 = 4 + 60 = 64
x = (2 + 8)/-2 = - 5
x = (2 - 8)/-2 = 3
ответ: -5; 3
I hope this helps you
-x2 - 2x + 15 = 0
D = (-2)квадрат - 4 * (-1) * 15 = 4 + 60 = 64
x = (2 + 8)/-2 = - 5
x = (2 - 8)/-2 = 3
ответ: -5; 3