Х³+2х²-9х-18 (х³-9х )+(2х²-18 ) х(х²-9)+2(х²-9)
---------------------- = -----------------------------= -------------------------- =
(х-3)*(х+2) (х-3)*(х+2) (х-3)*(х+2)
(х²-9)(х+2) (х+3)* (х-3)*(х+2)
= ------------------------ = ---------------------------- = х+3
(х-3)*(х+2) (х-3)*(х+2)