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X patrat-4x+4=0 vreau cu delta nu simple ca la gradinita..

Răspuns :

x²-4x+4=0
Δ=b²-4ac=16-16=0
x1=x2=-b/2a=4/2=2

II metoda
x²-4x+4=0⇔(x-2)²=0⇔x-2=0⇒x=2