-12x2 +2x +4 = 0
ax2 bx c = 0
a = -12
b = 2
c = 4
Δ = b2-4ac
Δ = 2² - (4 * -12 * 4)
Δ = 4 - (4*-48)
Δ = 4 - (-192)
Δ = 196 Δ > 0
-12x2+2x+4=0
x = -b ∓ √Δ 2a
x' = -2 - √196 2*-12 = -2 - 14.0 -24 = -16.0 -24 = 0.666666666667
x" = -2 + √196 2*-12 = -2 + 14.0 -24 = 12.0 -24 = -0.5
x' = 96.0
x" = -72.0
S = {x ∈ R / x' = 96.0, x" = -72.0 }