-4x2 -16x -12 = 0
ax2 bx c = 0
a = -4
b = -16
c = -12
Δ = b2-4ac
Δ = -16² - (4 * -4 * -12)
Δ = 256 - (4*48)
Δ = 256 - (192)
Δ = 64 Δ > 0
-4x2-16x-12=0
x = -b ∓ √Δ 2a
x' = 16 - √64 2*-4 = 16 - 8.0 -8 = 8.0 -8 = -1.0
x" = 16 + √64 2*-4 = 16 + 8.0 -8 = 24.0 -8 = -3.0
x' = -16.0
x" = -48.0
S = {x ∈ R / x' = -16.0, x" = -48.0 }