-12x2 +x +11 = 0
ax2 bx c = 0
a = -12
b = 1
c = 11
Δ = b2-4ac
Δ = ² - (4 * -12 * 11)
Δ = 1 - (4*-132)
Δ = 1 - (-528)
Δ = 529 Δ > 0
-12x2+x+11=0
x = -b ∓ √Δ 2a
x' = -1 - √529 2*-12 = -1 - 23.0 -24 = -24.0 -24 = 1.0
x" = -1 + √529 2*-12 = -1 + 23.0 -24 = 22.0 -24 = -0.916666666667
x' = 144.0
x" = -132.0
S = {x ∈ R / x' = 144.0, x" = -132.0 }