Explicación paso a paso:
vértice
Xv=-b/2a=0/2(-1)=0
yv=f(-b/2a)=-(0)^2+4=4
Eje de simetría X=0
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Explicación paso a paso:
vértice
Xv=-b/2a=0/2(-1)=0
yv=f(-b/2a)=-(0)^2+4=4
Eje de simetría X=0