18 х 4
------ = --------+--------
х2-9 х+3 х-3
18 х2-3х 4х+12
------------ = --------------+-------------
(х-3)(х+3) (х-3)(х+3) (х-3)(х+3)
18 х2-3х+4х+12
------------ = ------------------
(х-3)(х+3) (х-3)(х+3)
18 х2+х+12
--------------= --------------
(х-3)(х+3) (х-3)(х+3)
х2+х+12=18
(х-3)(х+3)не равен 0
х2+х-6=0
D=1+24=25
х1=-1+5/2=2 х2=-1-5/2=-6/2=-3