-4x2 -8x +12 = 0
ax2 bx c = 0
a = -4
b = -8
c = 12
Δ = b2-4ac
Δ = -8² - (4 * -4 * 12)
Δ = 64 - (4*-48)
Δ = 64 - (-192)
Δ = 256 Δ > 0
-4x2-8x+12=0
x = -b ∓ √Δ 2a
x' = 8 - √256 2*-4 = 8 - 16.0 -8 = -8.0 -8 = 1.0
x" = 8 + √256 2*-4 = 8 + 16.0 -8 = 24.0 -8 = -3.0
x' = 16.0
x" = -48.0
S = {x ∈ R / x' = 16.0, x" = -48.0 }