escreva as coordenadas do vertice da parabola que representa cada função:
(a).f(x)=(x-9)²
(b).(x)=(x+3)²
(a).f(x)=(x-9)²
(b).(x)=(x+3)²
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x^2+2.x.(-9)+(-9)^2
x^2-18x+81=0
delta=b^2-4ac
delta=(-18)^2-4.1.81
delta=324-324
delta=0
xv=-b/2a
xv=-(-18)/2.1
xv=18/2
xv=9
yv=-delta/4a
yv=-0/4.1
yv=-0/4
yv=-0
(9, 0)
b) (x)=(x+3)^2
x^2+2.x.3+3^2
x^2+6x+9=0
delta=b^2-4ac
delta=6^2-4.1.9
delta=36-36
delta=0
xv=-b/2a
xv=-6/2.1
xv=-6/2
xv=-3
yv=-delta/4a
yv=-0/4.1
yv=-0/4
yv=0
(-3, 0)