(15х+4-(3х-2))×(15х+4+3х-2))
(15х+4-3х+2)×(15х+4+3х-3)
(12х+6)(18х+2)
6(2х+1)×2(9х+1)
6×2(2х+1)×(9х+1)
12(2х+1)×(9х+1)
(х+2-2х)×(х+2+2х)
(-х+2)×(3х+2)
(15х+4-(3х-2))×(15х+4+3х-2))
(15х+4-3х+2)×(15х+4+3х-3)
(12х+6)(18х+2)
6(2х+1)×2(9х+1)
6×2(2х+1)×(9х+1)
12(2х+1)×(9х+1)
(х+2-2х)×(х+2+2х)
(-х+2)×(3х+2)