-4x2 +18x -14 = 0
ax2 bx c = 0
a = -4
b = 18
c = -14
Δ = b2-4ac
Δ = 18² - (4 * -4 * -14)
Δ = 324 - (4*56)
Δ = 324 - (224)
Δ = 100 Δ > 0
-4x2+18x-14=0
x = -b ∓ √Δ 2a
x' = -18 - √100 2*-4 = -18 - 10.0 -8 = -28.0 -8 = 3.5
x" = -18 + √100 2*-4 = -18 + 10.0 -8 = -8.0 -8 = 1.0
x' = 56.0
x" = 16.0
S = {x ∈ R / x' = 56.0, x" = 16.0 }