-12x2 +8x -1 = 0
ax2 bx c = 0
a = -12
b = 8
c = -1
Δ = b2-4ac
Δ = 8² - (4 * -12 * -1)
Δ = 64 - (4*12)
Δ = 64 - (48)
Δ = 16 Δ > 0
-12x2+8x-1=0
x = -b ∓ √Δ 2a
x' = -8 - √16 2*-12 = -8 - 4.0 -24 = -12.0 -24 = 0.5
x" = -8 + √16 2*-12 = -8 + 4.0 -24 = -4.0 -24 = 0.166666666667
x' = 72.0
x" = 24.0
S = {x ∈ R / x' = 72.0, x" = 24.0 }