-4x2 -8x -4 = 0
ax2 bx c = 0
a = -4
b = -8
c = -4
Δ = b2-4ac
Δ = -8² - (4 * -4 * -4)
Δ = 64 - (4*16)
Δ = 64 - (64)
Δ = 0 Δ = 0
x = -b 2*a
x = 8 2*-4
x = -1.0
S = {x ∈ R / x = -1.0}
-4x2 -8x -4 = 0
ax2 bx c = 0
a = -4
b = -8
c = -4
Δ = b2-4ac
Δ = -8² - (4 * -4 * -4)
Δ = 64 - (4*16)
Δ = 64 - (64)
Δ = 0 Δ = 0
x = -b 2*a
x = 8 2*-4
x = -1.0
S = {x ∈ R / x = -1.0}