Помогите (x-5)(x+5)^2+2

(x - 5)(x^2 + 10x + 25) + 2 = = x^2 (x - 5) + 10x(x  - 5) + 25(x - 5) + 2 = = x^3 - 5x^2 + 10x^2 - 50x + 25x - 125 + 2 = = x^3 + 5x^2 - 25x - 123