Question

Здравствуйте.Помогите пожалуйста
1. x2 + 2x – 3 = 0
D =
x2 =
x1 + x2 =
x2 + 5x – 36 = 0
D =
x2 =
x1 + x2 =
x2 – 10x + 21 = 0
D =
x2 =
x1 + x2 =
x2 – 8x + 15 = 0
D =
x2 =
x1 + x2 =

Answer 1

Ответ:

D=4-4×1×(-3)=16=4^2

x2=-2-4/2=-1

x1+x2=-2