Help.
( d - 4b)^3
C(3,0) *d^3 - C(3,1)* d^2 * (4b) + C(3,2)* d * (4b)^2 - C(3,3)*(4b)^3
1 * d^3 - 3*d^2 * (4b) + 3 * d * 16b^2 - 1 * 64b^3
d^3 - 12d^2b + 48db^2 - 64b^3