-4x2 -6x -2 = 0
ax2 bx c = 0
a = -4
b = -6
c = -2
Δ = b2-4ac
Δ = -6² - (4 * -4 * -2)
Δ = 36 - (4*8)
Δ = 36 - (32)
Δ = 4 Δ > 0
-4x2-6x-2=0
x = -b ∓ √Δ 2a
x' = 6 - √4 2*-4 = 6 - 2.0 -8 = 4.0 -8 = -0.5
x" = 6 + √4 2*-4 = 6 + 2.0 -8 = 8.0 -8 = -1.0
x' = -8.0
x" = -16.0
S = {x ∈ R / x' = -8.0, x" = -16.0 }