-12x2 +2x +14 = 0
ax2 bx c = 0
a = -12
b = 2
c = 14
Δ = b2-4ac
Δ = 2² - (4 * -12 * 14)
Δ = 4 - (4*-168)
Δ = 4 - (-672)
Δ = 676 Δ > 0
-12x2+2x+14=0
x = -b ∓ √Δ 2a
x' = -2 - √676 2*-12 = -2 - 26.0 -24 = -28.0 -24 = 1.16666666667
x" = -2 + √676 2*-12 = -2 + 26.0 -24 = 24.0 -24 = -1.0
x' = 168.0
x" = -144.0
S = {x ∈ R / x' = 168.0, x" = -144.0 }