-4x2 -8x -3 = 0
ax2 bx c = 0
a = -4
b = -8
c = -3
Δ = b2-4ac
Δ = -8² - (4 * -4 * -3)
Δ = 64 - (4*12)
Δ = 64 - (48)
Δ = 16 Δ > 0
-4x2-8x-3=0
x = -b ∓ √Δ 2a
x' = 8 - √16 2*-4 = 8 - 4.0 -8 = 4.0 -8 = -0.5
x" = 8 + √16 2*-4 = 8 + 4.0 -8 = 12.0 -8 = -1.5
x' = -8.0
x" = -24.0
S = {x ∈ R / x' = -8.0, x" = -24.0 }