-12x2 +x +1 = 0
ax2 bx c = 0
a = -12
b = 1
c = 1
Δ = b2-4ac
Δ = ² - (4 * -12 * 1)
Δ = 1 - (4*-12)
Δ = 1 - (-48)
Δ = 49 Δ > 0
-12x2+x+1=0
x = -b ∓ √Δ 2a
x' = -1 - √49 2*-12 = -1 - 7.0 -24 = -8.0 -24 = 0.333333333333
x" = -1 + √49 2*-12 = -1 + 7.0 -24 = 6.0 -24 = -0.25
x' = 48.0
x" = -36.0
S = {x ∈ R / x' = 48.0, x" = -36.0 }