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x²+16x+64=0
Δ=b²-4ac=16²-4×64=256-256=0
x₀=-b:2a=-16:2=-8
x2+16x+64=0
delta= b2 - 4ac
delta=256- 4*1*64= 256-256=0
xo= -b / 2a
xo= -16/ 2*1= -8
odp: -8