Question

1) (х-4)(х+2)=-х(х+2)
2) (х+1)(х-1)=8
3) х(х+3)=-(х-3)(х+3)
4) 2х(х-1)=-2х(х+1)+12

Answer 1

1)х^2+2х-4х-8=-х^2-2х
2х^2=8
Х^2=4
Х=2
2)х^2-1=8
Х^2=9
Х=3
3)х^2+3х=-х^2+9
2х^2+3х=9
4)2х^2-2х=-2х^2-2х+12
4х^2=12
Х^2=3
Х=корень3