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f(x)=-2x²+20x-43
En donde :
a=-2
b=20
c=-43
Vertice : (h;k)
Entonces :
f(k)=-2(h)²+20(h)-43
f(k)=-2(5)²+20(5)-43
f(k)=-2(25)+100-43
f(k)=-50+100-43
f(k)=50-43
f(k)=7
Respuesta: V=(5;7)