-12x2 -11x +1 = 0
ax2 bx c = 0
a = -12
b = -11
c = 1
Δ = b2-4ac
Δ = -11² - (4 * -12 * 1)
Δ = 121 - (4*-12)
Δ = 121 - (-48)
Δ = 169 Δ > 0
-12x2-11x+1=0
x = -b ∓ √Δ 2a
x' = 11 - √169 2*-12 = 11 - 13.0 -24 = -2.0 -24 = 0.0833333333333
x" = 11 + √169 2*-12 = 11 + 13.0 -24 = 24.0 -24 = -1.0
x' = 12.0
x" = -144.0
S = {x ∈ R / x' = 12.0, x" = -144.0 }