Question

A opçao que indica as coordenadas do vertice da funçao Y=X^2-6X+8
A)(3,-1)
B)(-3,1)
C)(-3,-1)
D)(3,1)
Obs e pra amanha me ajudem pf

Answer 1

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y=x² -6x+8

a=1
b=-6
c=8

$Xv=- \frac{b}{2a} = \frac{-(-6)}{2} = \frac{6}{2} =3 \\ \\ Yv= \frac{-\Delta}{4a} = \frac{-4}{4} =-1 \\ \\ Letra~~A \\ \\ \Delta=b^2-4ac \\ \Delta=(-6)^2-4(1)(8) \\ \Delta=36-32 \\ \Delta=4$