Действие 10x^2 - (4x - 1)*(1 + 4x) можно упростить, раскрыв скобки:

10x^2 - (4x - 1)*(1 + 4x) = 10x^2 - (4x - 1 - 16x) = 10x^2 - (4x - 1 - 16x) = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2 - 4x + 1 + 16x = 10x^2

Поэтому результатом выполнения действия 10x^2 - (4x - 1)*(1 + 4x) будет 10x^2 - 4x + 1 - 4x^2 = 10x^2 - 4x + 1 - 4x^2 = 6x^2 - 4x + 1.