8- 2(х²+2х)/3 - 4(х²+2х)/3 + (х²+2х)²/9 = 3
8 - 2х²+4х/3 - 4х²+8х/3 + х∧4 +4х³+4х²/9 = 3
8 - 2х²+4х/3 - 4х²+8х/3 + х∧4 +4х³+4х²/9 - 3 = 0
5 - 2х²+4х/3 - 4х²+8х/3 + х∧4 +4х³+4х²/9 = 0
45-3(2х²+4х)-3(4х²+8х)+х∧4+4х³+4х²/9 = 0
45-6х²-12х-12х²-24х+х∧4+4х³+4х²/9 = 0
45-14х²-36х+х∧4+4х³/ 9 = 0
45-14х²-36х+х∧4+4х³=0
х∧4+4х³-14х²-36х+45=0
х∧4-х³+5х³-5х²-9х²+9х-45х+45=0
х³(х-1)+5х²(х-1)-9х(х-1)-45(х-1)=0
(х-1)(х³+5х²-9х-45)=0
(х-1)(х²(х+5)-9(х+5))=0
(х-1)(х²-9)(х+5)=0
х-1=0
х²-9=0
х+5=0
х=1
х=3
х=-3
х=-5
Ответ х1=-5 , х2=-3 , х3=1 , х4=3