Question

Решите уравнение
(2х+1)•(х+2)-(х-1)•(3х+1)=1​

Answer 1

(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