-18x2 +19x +14 = 0
ax2 bx c = 0
a = -18
b = 19
c = 14
Δ = b2-4ac
Δ = 19² - (4 * -18 * 14)
Δ = 361 - (4*-252)
Δ = 361 - (-1008)
Δ = 1369 Δ > 0
-18x2+19x+14=0
x = -b ∓ √Δ 2a
x' = -19 - √1369 2*-18 = -19 - 37.0 -36 = -56.0 -36 = 1.55555555556
x" = -19 + √1369 2*-18 = -19 + 37.0 -36 = 18.0 -36 = -0.5
x' = 504.0
x" = -162.0
S = {x ∈ R / x' = 504.0, x" = -162.0 }