4x^2 + 4x + 1 = 0;
D = b^2 - 4ac;
D = 4^2 - 4 * 4 * 1;
D = 16 - 16 = 0;
D = 0, один корень!
x1 = -b/2a;
x1:x = -4/2*4;
x = -4/8;
x = -1/2;
Ответ: -1/2.
2) 1x^2 - 10x + 36 = 0;
D = b^2 - 4ac;
D = -10^2 - 4 * 1 * 36;
D = 100 - 144 = -44;
D < 0, корней нет!
Ответ: x ∈ Ø.