Ответ:
х²+8х-20=0
D=64+80=144
√144=12
х1= -8+12/2= 2
х2= -8-12/2= -10
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Ответ:
х²+8х-20=0
D=64+80=144
√144=12
х1= -8+12/2= 2
х2= -8-12/2= -10