-4x2 -14x -12 = 0
ax2 bx c = 0
a = -4
b = -14
c = -12
Δ = b2-4ac
Δ = -14² - (4 * -4 * -12)
Δ = 196 - (4*48)
Δ = 196 - (192)
Δ = 4 Δ > 0
-4x2-14x-12=0
x = -b ∓ √Δ 2a
x' = 14 - √4 2*-4 = 14 - 2.0 -8 = 12.0 -8 = -1.5
x" = 14 + √4 2*-4 = 14 + 2.0 -8 = 16.0 -8 = -2.0
x' = -24.0
x" = -32.0
S = {x ∈ R / x' = -24.0, x" = -32.0 }