(2х+1)×(х+2)-(х-1)×(3х+1)=1
2х²+4х+х+2-(3х²+х-3х-1)=1
2х²+4х+х+2-(3х²-2х-1)=1
2х²+4х+х+2-3х²+2х+1=1
2х²+4х+х+2-3х²+2х=0
-х²+7х+2=0
х²-7х-2=0
D=(-7)²-4×1×(-2)=57
(2х+1)×(х+2)-(х-1)×(3х+1)=1
2х²+4х+х+2-(3х²+х-3х-1)=1
2х²+4х+х+2-(3х²-2х-1)=1
2х²+4х+х+2-3х²+2х+1=1
2х²+4х+х+2-3х²+2х=0
-х²+7х+2=0
х²-7х-2=0
D=(-7)²-4×1×(-2)=57