Question

resolva a funcão f(x)=-x²-4x-4.

Answer 1

a= -1
b= -4
c= -4

b²-4.a.c =
-4² - 4.(-1).(-4) =
16 - 16 = 
0

Answer 2

f(x) = - x² - 4x - 4
0 = - x² - 4x - 4
- x² - 4x - 4 = 0 ( - 1)
x² + 4x + 4 = 0

a = 1; b = 4; c = 4

Δ = b² - 4ac
Δ = 4² - 4.1.4
Δ = 16 - 16
Δ = 0

x = - b +/- √Δ      - 4 +/- √0
      ------------- = --------------
            2a                2.1

x = - 4
       ----  =  - 2
        2

x = - 2

Resp.: x = - 2