X1 = -1; x2 = 3.
c =x1 * x2 = - 1 * 3 = - 3;
- b = x1 + x2 = - 1 + 3 = 2; b = - 2
x^2 + b*x + c = 0;
x^2 - 2 x - 3 = 0.
2) x1 = - 4;
x2 = 0;
c = x1 * x2 = - 4 * 0 = 0;
- b = x1 + x2 = - 4 + 0 = - 4; b = 4
x^2 + b* x + c = 0;
x^2 + 4x = 0
А)1 б)8 в)нет решения г)1/5 д)гет решения е)2*1/3
N - k + 2k + n + k / (n-k)(n+k) = 2n + 2k / (n-k)(n+k) = 2(n+k) / (n-k)(n+k) = 2/(n-k)