-The cubic power of 2A B + the square of 8A the square of B - the cubic power of 8ab

-The cubic power of 2A B + the square of 8A the square of B - the cubic power of 8ab

-The cubic power of 2A B + the square of 8A the square of B - the cubic power of 8ab
=-2ab(a^2-4ab+4b^2)
=-2ab(a-2b)^2