Question 939898
Either use Distributive Property or setup and use a lattice.
EDIT: Adding brief explanations.



{{{(2x-1)*x^2+4x(2x-1)-4(2x-1)}}}, Distributive Property
{{{2x^3-x^2+8x^2-4x-8x+4}}},Again, distributive property
{{{2x^3+7x^2-12x+4}}}, combine like-terms