1)(х + 9)^2 - х * (х + 8) = 1;
x^2 + 2 * 9 * x + 9^2 - x * x - 8 * x = 1;
x^2 + 18 * x + 81 - x^2 - 8 * x = 1;
18 * x + 81 - 8 * x = 1;
10 * x + 81 = 1;
10 * x = 1 - 81;
10 * x = -80;
x = -80/10;
x = -8/1;
x = -8;
ответ: х = -8.
2)
1)(х + 9)^2 - х * (х + 8) = 1;
x^2 + 2 * 9 * x + 9^2 - x * x - 8 * x = 1;
x^2 + 18 * x + 81 - x^2 - 8 * x = 1;
18 * x + 81 - 8 * x = 1;
10 * x + 81 = 1;
10 * x = 1 - 81;
10 * x = -80;
x = -80/10;
x = -8/1;
x = -8;
ответ: х = -8.
2)