-6x2 -19x -3 = 0
ax2 bx c = 0
a = -6
b = -19
c = -3
Δ = b2-4ac
Δ = -19² - (4 * -6 * -3)
Δ = 361 - (4*18)
Δ = 361 - (72)
Δ = 289 Δ > 0
-6x2-19x-3=0
x = -b ∓ √Δ 2a
x' = 19 - √289 2*-6 = 19 - 17.0 -12 = 2.0 -12 = -0.166666666667
x" = 19 + √289 2*-6 = 19 + 17.0 -12 = 36.0 -12 = -3.0
x' = -6.0
x" = -108.0
S = {x ∈ R / x' = -6.0, x" = -108.0 }