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restringeti in patrate:
9-6y+[tex] y^{2} [/tex]


Răspuns :

[tex] y^{2}-6y+9= (y-3)^{2}. [/tex]
y²-6y+9=0
Δ=36-36=0
y₁=y₂=6/2=3
y²-6y+9=(y-3)(y-3)=(y-3)²