а) х2+3х=4
х2+3х-4=0
х2+4х-х=0
х2+4х-х-4=0
х*(х+4)-(х+4)=0
(х+4)*(х-1)=0
х+4=0
х-1=0
х=-4
х=1
х1=-4;х2=1.
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а) х2+3х=4
х2+3х-4=0
х2+4х-х=0
х2+4х-х-4=0
х*(х+4)-(х+4)=0
(х+4)*(х-1)=0
х+4=0
х-1=0
х=-4
х=1
х1=-4;х2=1.