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sa se calculeze ecuatia: Xpatrat-X-2=0

Răspuns :

[tex] x^{2} -x-2=0 [/tex]
Δ=1+8=9
[tex] x_{1} = \frac{1+ \sqrt{9} }{2} =2[/tex]
[tex] x_{2} = \frac{1- \sqrt{9} }{2} =-1[/tex]