4x^2 - 2 * 2x * 5 + 25 - 4x^2 = 0;
4x^2 - 4x^2 - 20x + 25 = 0;
- 20x + 25 = 0.
- 20х = - 25;
х = - 25 : - 20 = 25/20 = 5/4 = 1 1/4 = 1,25.
ответ: х = 1,25.
4x^2 - 2 * 2x * 5 + 25 - 4x^2 = 0;
4x^2 - 4x^2 - 20x + 25 = 0;
- 20x + 25 = 0.
- 20х = - 25;
х = - 25 : - 20 = 25/20 = 5/4 = 1 1/4 = 1,25.
ответ: х = 1,25.