-12x2 -8x -1 = 0
ax2 bx c = 0
a = -12
b = -8
c = -1
Δ = b2-4ac
Δ = -8² - (4 * -12 * -1)
Δ = 64 - (4*12)
Δ = 64 - (48)
Δ = 16 Δ > 0
-12x2-8x-1=0
x = -b ∓ √Δ 2a
x' = 8 - √16 2*-12 = 8 - 4.0 -24 = 4.0 -24 = -0.166666666667
x" = 8 + √16 2*-12 = 8 + 4.0 -24 = 12.0 -24 = -0.5
x' = -24.0
x" = -72.0
S = {x ∈ R / x' = -24.0, x" = -72.0 }