(3х-1)(3х+1)-(х-1)(х+2)=8
9х²-1-х²-2х+х+2-8=0
8х²-х-7=0
D=(-1)²-4*8*(-7)=1+224=225
х1=1-15/16= -14/16= -7/8
х2=1+15/16=16/16=1
(3х-1)(3х+1)-(х-1)(х+2)=8
9х²-1-х²-2х+х+2-8=0
8х²-х-7=0
D=(-1)²-4*8*(-7)=1+224=225
х1=1-15/16= -14/16= -7/8
х2=1+15/16=16/16=1