Question

me ajudem, estou com dúvidas

Answer 1

Resposta:

O valor do x vértice é dado por:Xv= -b/2a

O valor do y vértice é dado por:Yv= -∆/4a

a)(0, 3/2)

y=-x²+9

a=-1

b=0

c=9

Xv=-b/2a

Xv=-0/2.-1

Xv=0

Yv=-∆/4a

Yv=-(b²-4ac)/4a

Yv=-(0-4.-1.9)/4.-1

Yv=-36/-4

Yv=9

b)(5/2, -5/4)

y=x²-5x

a=1

b=-5

c=0

Xv=-(-5)/2a

Xv=5/2.1

Xv=5/2

Yv=-∆/4a

Yv=-(b²-4ac)/4a

Yv=-((-5)²-4.1.0)/4.1

Yv=-25/4

Yv=-25/4

c)(2, -3/2)

y=x²-4x-5

a=1

b=-4

c=-5

Xv=-b/2a

Xv=-(-4)/2.1

Xv=2

Yv=-∆/4a

Yv=-(b²-4ac)/4a

Yv=-((-4)²-4.1.-5)/4.1

Yv=-36/4

Yv=-9

d)(-1/2, 0)

y=x²+x+1/4

a=1

b=1

c=1/4

Xv=-b/2a

Xv=-1/2.1

Xv=-1/2

Yv=-∆/4a

Yv=-(b²-4ac)/4a

Yv=-(1²-4.1.1/4)/4.1

Yv=-0/4

Yv=0