2)3х+9х^2-12=0
х+3х^2-4=0
3х^2+х-4=0
3х^2+4х-3х-4=0
х×(3х+4)-(3х+4)=0
(3х+4)×(х-1)=0
3х+4=0
х-1=0
х=-4/3
х=1.
2)3х+9х^2-12=0
х+3х^2-4=0
3х^2+х-4=0
3х^2+4х-3х-4=0
х×(3х+4)-(3х+4)=0
(3х+4)×(х-1)=0
3х+4=0
х-1=0
х=-4/3
х=1.