-12x2 -10x -2 = 0
ax2 bx c = 0
a = -12
b = -10
c = -2
Δ = b2-4ac
Δ = -10² - (4 * -12 * -2)
Δ = 100 - (4*24)
Δ = 100 - (96)
Δ = 4 Δ > 0
-12x2-10x-2=0
x = -b ∓ √Δ 2a
x' = 10 - √4 2*-12 = 10 - 2.0 -24 = 8.0 -24 = -0.333333333333
x" = 10 + √4 2*-12 = 10 + 2.0 -24 = 12.0 -24 = -0.5
x' = -48.0
x" = -72.0
S = {x ∈ R / x' = -48.0, x" = -72.0 }