х²=2-х
х²-2+х=0
х²+х-2=0
Д=1²-4*1*(-2)=9
х=-1±3/2
х=-1+3/2=1
х=-1-3/2=-2
Ответ х=-2
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х²=2-х
х²-2+х=0
х²+х-2=0
Д=1²-4*1*(-2)=9
х=-1±3/2
х=-1+3/2=1
х=-1-3/2=-2
Ответ х=-2