-6x2 -11x -3 = 0
ax2 bx c = 0
a = -6
b = -11
c = -3
Δ = b2-4ac
Δ = -11² - (4 * -6 * -3)
Δ = 121 - (4*18)
Δ = 121 - (72)
Δ = 49 Δ > 0
-6x2-11x-3=0
x = -b ∓ √Δ 2a
x' = 11 - √49 2*-6 = 11 - 7.0 -12 = 4.0 -12 = -0.333333333333
x" = 11 + √49 2*-6 = 11 + 7.0 -12 = 18.0 -12 = -1.5
x' = -12.0
x" = -54.0
S = {x ∈ R / x' = -12.0, x" = -54.0 }