Resposta :
f(x)=2x²-x+3.
xv=-b/2.a
yv=-Δ/4.a
Xv=-(-1)/2.2
Xv=1/4
Yv=-((-1)²-4.2.3)/4.2
Yv=-(1-24)/8
Yv=23/8
Xv+Yv=1/4+23/8=25/8=3,125
xv=-b/2.a
yv=-Δ/4.a
Xv=-(-1)/2.2
Xv=1/4
Yv=-((-1)²-4.2.3)/4.2
Yv=-(1-24)/8
Yv=23/8
Xv+Yv=1/4+23/8=25/8=3,125