(2xx-3x+1)^2-22xx+33x-1
=(2xx-3x+1)^2-11(2xx-3x+1)+10
=(2xx-3x+1-10)(2xx-3x+1-1)
=(2xx-3x-9)(2xx-3x)
=x(2x+3)(x-3)(2x-3)