по т. Виета х₁*х₂=с=20
Д=144-4*1*20=64
х1=-12+8/2=-4/2=-2
х2=-12-8/2=-20/2=-10
х1*х2=-2*(-10)=20
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по т. Виета х₁*х₂=с=20
Verified answer
Д=144-4*1*20=64
х1=-12+8/2=-4/2=-2
х2=-12-8/2=-20/2=-10
х1*х2=-2*(-10)=20