-12x2 -13x +14 = 0
ax2 bx c = 0
a = -12
b = -13
c = 14
Δ = b2-4ac
Δ = -13² - (4 * -12 * 14)
Δ = 169 - (4*-168)
Δ = 169 - (-672)
Δ = 841 Δ > 0
-12x2-13x+14=0
x = -b ∓ √Δ 2a
x' = 13 - √841 2*-12 = 13 - 29.0 -24 = -16.0 -24 = 0.666666666667
x" = 13 + √841 2*-12 = 13 + 29.0 -24 = 42.0 -24 = -1.75
x' = 96.0
x" = -252.0
S = {x ∈ R / x' = 96.0, x" = -252.0 }