-12x2 -14x -4 = 0
ax2 bx c = 0
a = -12
b = -14
c = -4
Δ = b2-4ac
Δ = -14² - (4 * -12 * -4)
Δ = 196 - (4*48)
Δ = 196 - (192)
Δ = 4 Δ > 0
-12x2-14x-4=0
x = -b ∓ √Δ 2a
x' = 14 - √4 2*-12 = 14 - 2.0 -24 = 12.0 -24 = -0.5
x" = 14 + √4 2*-12 = 14 + 2.0 -24 = 16.0 -24 = -0.666666666667
x' = -72.0
x" = -96.0
S = {x ∈ R / x' = -72.0, x" = -96.0 }