Question

as coordenadas do vértice f(x)=x²+10x+21

Answer 1

Xv= -b/2a
Xv = -10/2
Xv = -5

Yv= -delta/4a
Yv=  - raiz 100 -84 
Yv= - raiz 16/4a
Yv = -4 /4
Yv= -1