-6x2 -19x -8 = 0
ax2 bx c = 0
a = -6
b = -19
c = -8
Δ = b2-4ac
Δ = -19² - (4 * -6 * -8)
Δ = 361 - (4*48)
Δ = 361 - (192)
Δ = 169 Δ > 0
-6x2-19x-8=0
x = -b ∓ √Δ 2a
x' = 19 - √169 2*-6 = 19 - 13.0 -12 = 6.0 -12 = -0.5
x" = 19 + √169 2*-6 = 19 + 13.0 -12 = 32.0 -12 = -2.66666666667
x' = -18.0
x" = -96.0
S = {x ∈ R / x' = -18.0, x" = -96.0 }