Найдем х.
√(2 + 7 * x) = 6 - x;
2 + 7 * x = 36 - 12 * x + x^2;
x^2 - 12 * x + 36 - 7 * x - 2 = 0;
x^2 - 19 * x + 34 = 0;
D = 361 - 4 * 1 * 34 = 225;
x1 = (19 + 15)/2 = 34/2 = 17;
x2 = (19 - 15)/2 = 2.
Найдем х.
√(2 + 7 * x) = 6 - x;
2 + 7 * x = 36 - 12 * x + x^2;
x^2 - 12 * x + 36 - 7 * x - 2 = 0;
x^2 - 19 * x + 34 = 0;
D = 361 - 4 * 1 * 34 = 225;
x1 = (19 + 15)/2 = 34/2 = 17;
x2 = (19 - 15)/2 = 2.