1) -х+х=х²-1-2
0=х²-3
-х²=-3
х²=3
х=√3
2) 2х+х=х²-2-2
3х=х²-4
х²-3х-4=0
Д = (-3)²+4•1•4=9+16=25
√Д = √25 = 5
х1,2 = 3±√Д/ 2
х1= 3+5/2= 8/2=4
х2= 3-5/2 = -2/2=-1
3) х=х²-2
х²-х-2=0
Д = (-1)²+4•1•2=1+8=9
√Д= √9=3
х1,2= 1±3/2
х1= 1+3/2=4/2=2
х2=1-3/2=-2/2=-1
1) -х+х=х²-1-2
0=х²-3
-х²=-3
х²=3
х=√3
2) 2х+х=х²-2-2
3х=х²-4
х²-3х-4=0
Д = (-3)²+4•1•4=9+16=25
√Д = √25 = 5
х1,2 = 3±√Д/ 2
х1= 3+5/2= 8/2=4
х2= 3-5/2 = -2/2=-1
3) х=х²-2
х²-х-2=0
Д = (-1)²+4•1•2=1+8=9
√Д= √9=3
х1,2= 1±3/2
х1= 1+3/2=4/2=2
х2=1-3/2=-2/2=-1