-12x2 +14x +6 = 0
ax2 bx c = 0
a = -12
b = 14
c = 6
Δ = b2-4ac
Δ = 14² - (4 * -12 * 6)
Δ = 196 - (4*-72)
Δ = 196 - (-288)
Δ = 484 Δ > 0
-12x2+14x+6=0
x = -b ∓ √Δ 2a
x' = -14 - √484 2*-12 = -14 - 22.0 -24 = -36.0 -24 = 1.5
x" = -14 + √484 2*-12 = -14 + 22.0 -24 = 8.0 -24 = -0.333333333333
x' = 216.0
x" = -48.0
S = {x ∈ R / x' = 216.0, x" = -48.0 }