-6x2 -19x -14 = 0
ax2 bx c = 0
a = -6
b = -19
c = -14
Δ = b2-4ac
Δ = -19² - (4 * -6 * -14)
Δ = 361 - (4*84)
Δ = 361 - (336)
Δ = 25 Δ > 0
-6x2-19x-14=0
x = -b ∓ √Δ 2a
x' = 19 - √25 2*-6 = 19 - 5.0 -12 = 14.0 -12 = -1.16666666667
x" = 19 + √25 2*-6 = 19 + 5.0 -12 = 24.0 -12 = -2.0
x' = -42.0
x" = -72.0
S = {x ∈ R / x' = -42.0, x" = -72.0 }