x²-8x-20=0
a=1;b=-8;c=-20
D=b²-4ac=(-8)²-4·1·(-20)=64+80=144
x1=(-b-√D)/(2a)=(-(-8-√144))/(2·1)=(8-12)/2=(-4)/2=-2
x2=(-b+√D)/(2a)=(-(-8+√144)/(2·1)=(8+12)/2=20/2=10
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x²-8x-20=0
a=1;b=-8;c=-20
D=b²-4ac=(-8)²-4·1·(-20)=64+80=144
x1=(-b-√D)/(2a)=(-(-8-√144))/(2·1)=(8-12)/2=(-4)/2=-2
x2=(-b+√D)/(2a)=(-(-8+√144)/(2·1)=(8+12)/2=20/2=10