Respostas

2014-08-03T16:14:52-03:00
Y=-X²+6X-9   X(-1)
Y=X²-6X+9

Δ=(-6)²-4.1.-9
Δ=36+36
Δ=72

Y=6+/-
√72/2
Y=6+/-6√2/2
Y=3+/-3
√2

Y1=6√2
Y2=√2
1 3 1
2014-08-03T16:31:44-03:00
-x²+6x-9 = 0 x (-1)

x² - 6x + 9 = 0

Δ = 36 - 36

Δ = 0

x' = x" = 6/2

x' = x" = 3

As coordenadas do vértice:

XV = - b/2a

XV = - 6/- 2

XV = 3

YV = - Δ/4a

YV = 0

V(3, 0)