-2(x+2)x^2 - (x+5)(x^2 - 5x + 25) =-2x^3 - 4x^2 - x^3 + 5x^2 - 25x + 5x^2 - 25x + 125 =-3x^3 + 6x^2 - 50x + 125
-2(x+2)x^2 - (x+5)(x^2 - 5x + 25) =
-2x^3 - 4x^2 - x^3 + 5x^2 - 25x + 5x^2 - 25x + 125 =
-3x^3 + 6x^2 - 50x + 125