-6x2 -5x +14 = 0
ax2 bx c = 0
a = -6
b = -5
c = 14
Δ = b2-4ac
Δ = -5² - (4 * -6 * 14)
Δ = 25 - (4*-84)
Δ = 25 - (-336)
Δ = 361 Δ > 0
-6x2-5x+14=0
x = -b ∓ √Δ 2a
x' = 5 - √361 2*-6 = 5 - 19.0 -12 = -14.0 -12 = 1.16666666667
x" = 5 + √361 2*-6 = 5 + 19.0 -12 = 24.0 -12 = -2.0
x' = 42.0
x" = -72.0
S = {x ∈ R / x' = 42.0, x" = -72.0 }