5х²-4х-1=0
a=5,b=-4,c=-1
Д=b²-4ac=(-4)²-4*(-1)*5=16+20=36
х=-b±√Д/2а=4±6/10
х1=4+6/10=1
х2=4-6/10=-0,2
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5х²-4х-1=0
a=5,b=-4,c=-1
Д=b²-4ac=(-4)²-4*(-1)*5=16+20=36
х=-b±√Д/2а=4±6/10
х1=4+6/10=1
х2=4-6/10=-0,2