Expanding the expression, we have:
(х-2)(х^2+2х+4) - (1+х)(х^2-х+1)= х^3 + 2х^2 + 4x - 2х^2 - 4х - 8 - х^3 + hx^2 - x - х^2 + х - 1= х^3 + 2х^2 + 4x - 2х^2 - 4x - 8 - х^3 + х^2 - x - х^2 + х - 1= 0 - 8 - 1= -9
Therefore, the simplified expression is -9.
Expanding the expression, we have:
(х-2)(х^2+2х+4) - (1+х)(х^2-х+1)
= х^3 + 2х^2 + 4x - 2х^2 - 4х - 8 - х^3 + hx^2 - x - х^2 + х - 1
= х^3 + 2х^2 + 4x - 2х^2 - 4x - 8 - х^3 + х^2 - x - х^2 + х - 1
= 0 - 8 - 1
= -9
Therefore, the simplified expression is -9.