-18x2 -8x +10 = 0
ax2 bx c = 0
a = -18
b = -8
c = 10
Δ = b2-4ac
Δ = -8² - (4 * -18 * 10)
Δ = 64 - (4*-180)
Δ = 64 - (-720)
Δ = 784 Δ > 0
-18x2-8x+10=0
x = -b ∓ √Δ 2a
x' = 8 - √784 2*-18 = 8 - 28.0 -36 = -20.0 -36 = 0.555555555556
x" = 8 + √784 2*-18 = 8 + 28.0 -36 = 36.0 -36 = -1.0
x' = 180.0
x" = -324.0
S = {x ∈ R / x' = 180.0, x" = -324.0 }