20 БАЛЛОВ!

Question

20 БАЛЛОВ!

Answer 1

Решение:
х(x + 1)^2 = 2(x + 1);
x(x + 1) = 2;;  x + 1 = 0;
x^2 + x - 2 = 0;; x = -1;
D = 1^2 + 4*2*1 = 1 + 8 = 9.

x1 = (-1 + 3)/2 = 1;
x2 = (-1 - 3)/2 = -2