Question

-x^2+6x-9 função do 2° grau

Answer 1

-x² + 6x - 9 = 0

a = -1

b = 6

c = -9

Δ = b² - 4.a.c

Δ = 6² - 4.(-1).(-9)

Δ = 36 - 36

Δ = 0

Se Δ = 0, logo:

x = -b / 2.a

x = -6 / 2.(-1)

x = -6 / -2

x = 3

Answer 2

Eai Beleza !
_______________

–X²+ 6x- 9

A=1

B=6

C=-9

Δ= b²–4 • a • c

Δ= 6²– 4 • –1 • -9

Δ= 36 – 4 • –1 • -9

Δ= 36-36

Δ=0

X=(-b ±√Δ)
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2 • a

X=(-6+√0)
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2•-1

X= -6
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-2

X= 3