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Δ=b²-4ac
Δ=(-1)² -4*4*(-5)=1+80=81
√Δ=9
x1=(-b-√Δ)/(2a)
x1=(1-9)/8 = -8/8 =-1
x2=(-b+√Δ)/(2a)
x2=(1+9)/8 =10/8 =1,25
x∈{-1 ; 1,25}