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Rezolvati ecuatile:
c) -x² +x-1=0


Răspuns :

[tex] -x^{2} [/tex] = [tex]-x [/tex] x [tex]-x[/tex]
[tex]x[/tex] + x + 1 = 0
2x + 1=0 /-1
2x= 0-1
2x= -1
x= 2: (-1)
x= -2