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↓ a= - 4 functia are punct de maxim , virful parabolei
xvirf = - b/ 2a = - 4 / 2( -1)
x virf = 2
graficul functiei
V
daca x ∈( -∞ , 2 ) daca x ∈ [ 2 , ∞)
monoton monoton
crescatoare descrescatoare