(х+2)(х²-2х+4) - х*(х+2)(х-2) =
= (х³ + 8) - х*(х² - 4) = х³ + 8 - х³ + 4х = 4х + 8,
при х=1: 4*1 + 8 = 4 + 8 = 12
(х+2)(х²-2х+4) - х*(х+2)(х-2) =
= (х³ + 8) - х*(х² - 4) = х³ + 8 - х³ + 4х = 4х + 8,
при х=1: 4*1 + 8 = 4 + 8 = 12