(x-0.5)(1-1.5x)^2-x(2+0.25x)^2
=(x-0.5)(1-3x+2.25x^2)-x(4+x+0.625x^2)
=x-3x^2+2.25x^3-0.5+1.5x-1.125x^2-4x-x^2-0.625x^3
=1.625x^3-3.5x^2-1.5x-0.5