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 = -22.0 44 = -0.5
x" = 11 + √1089 2*22 = 11 + 33.0 44 = 44.0 44 = 1.0
x' = -242.0
x" = 484.0
S = {x ∈ R / x' = -242.0, x" = 484.0 }