-18x2 -11x +10 = 0
ax2 bx c = 0
a = -18
b = -11
c = 10
Δ = b2-4ac
Δ = -11² - (4 * -18 * 10)
Δ = 121 - (4*-180)
Δ = 121 - (-720)
Δ = 841 Δ > 0
-18x2-11x+10=0
x = -b ∓ √Δ 2a
x' = 11 - √841 2*-18 = 11 - 29.0 -36 = -18.0 -36 = 0.5
x" = 11 + √841 2*-18 = 11 + 29.0 -36 = 40.0 -36 = -1.11111111111
x' = 162.0
x" = -360.0
S = {x ∈ R / x' = 162.0, x" = -360.0 }