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Andreea2300
a fost răspuns

Calculati delta:
a= -1
b= 8
c=0

Răspuns :

Δ=b²-4*a*c
Δ=8²-4*(-1)*0=64

Alitta
Ecuatia are forma : - x² + 8x = 0  => Δ=8² -4*(/1)*0 = 64 ;

[tex]x_{1;2}=\frac{-b\pm\sqrt\Delta}{2a}=\frac{-8\pm8}{-2}\Rightarrow\;x_1=0\;si\;x_2=+8[/tex]