-12x2 +11x +23 = 0
ax2 bx c = 0
a = -12
b = 11
c = 23
Δ = b2-4ac
Δ = 11² - (4 * -12 * 23)
Δ = 121 - (4*-276)
Δ = 121 - (-1104)
Δ = 1225 Δ > 0
-12x2+11x+23=0
x = -b ∓ √Δ 2a
x' = -11 - √1225 2*-12 = -11 - 35.0 -24 = -46.0 -24 = 1.91666666667
x" = -11 + √1225 2*-12 = -11 + 35.0 -24 = 24.0 -24 = -1.0
x' = 276.0
x" = -144.0
S = {x ∈ R / x' = 276.0, x" = -144.0 }