(1-3х)(х+1)=(3х-1)(2х+1)

Question

(1-3х)(х+1)=(3х-1)(2х+1)

Answer 1

( 1 - 3х )( Х + 1 ) = ( 3х - 1 )( 2х + 1 )
Х + 1 - 3х^2 - 3х = 6х^2 + 3х - 2х - 1
- 3х^2 - 2х + 1 = 6х^2 + Х - 1
9х^2 + 3х - 2 = 0
D = 9 + 72 = 81 ; V81 = 9
X1 = ( - 3 + 9 ) : 18 = 1/3
X2 = ( - 3 - 9 ) : 18 = - 12/18 = - 2/3
Ответ 1/3 ; - 2/3