22x2 +11x -11 = 0
ax2 bx c = 0
a = 22
b = 11
c = -11
Δ = b2-4ac
Δ = 11² - (4 * 22 * -11)
Δ = 121 - (4*-242)
Δ = 121 - (-968)
Δ = 1089 Δ > 0
22x2+11x-11=0
x = -b ∓ √Δ 2a
x' = -11 - √1089 2*22 = -11 - 33.0 44 = -44.0 44 = -1.0
x" = -11 + √1089 2*22 = -11 + 33.0 44 = 22.0 44 = 0.5
x' = -484.0
x" = 242.0
S = {x ∈ R / x' = -484.0, x" = 242.0 }