-6x2 -14x -4 = 0
ax2 bx c = 0
a = -6
b = -14
c = -4
Δ = b2-4ac
Δ = -14² - (4 * -6 * -4)
Δ = 196 - (4*24)
Δ = 196 - (96)
Δ = 100 Δ > 0
-6x2-14x-4=0
x = -b ∓ √Δ 2a
x' = 14 - √100 2*-6 = 14 - 10.0 -12 = 4.0 -12 = -0.333333333333
x" = 14 + √100 2*-6 = 14 + 10.0 -12 = 24.0 -12 = -2.0
x' = -12.0
x" = -72.0
S = {x ∈ R / x' = -12.0, x" = -72.0 }