-12x2 +20x -3 = 0
ax2 bx c = 0
a = -12
b = 20
c = -3
Δ = b2-4ac
Δ = 20² - (4 * -12 * -3)
Δ = 400 - (4*36)
Δ = 400 - (144)
Δ = 256 Δ > 0
-12x2+20x-3=0
x = -b ∓ √Δ 2a
x' = -20 - √256 2*-12 = -20 - 16.0 -24 = -36.0 -24 = 1.5
x" = -20 + √256 2*-12 = -20 + 16.0 -24 = -4.0 -24 = 0.166666666667
x' = 216.0
x" = 24.0
S = {x ∈ R / x' = 216.0, x" = 24.0 }