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x²-8x+16-36=0
x²-8x-20=0
Δ=b²-4ac
Δ=64+80=144
√Δ=12
x1=(-b+√Δ)/(2a)=(8+12)/2 =10
x2=(-b-√Δ)/(2a) =(8-12)/2 =-2