(х-2)^2-(х+3)^2= (х-3)^3+9х^2-27х+20= (2х+1)^3-6х^2-3х-2=

(х-2)^2-(х+3)^2 = -8х - 13

(х-3)^3+9х^2-27х+20 = x^3 - 27x + 29

(2х+1)^3-6х^2-3х-2 = 8x^3 + 12x - 2