22x2 -9x -1 = 0
ax2 bx c = 0
a = 22
b = -9
c = -1
Δ = b2-4ac
Δ = -9² - (4 * 22 * -1)
Δ = 81 - (4*-22)
Δ = 81 - (-88)
Δ = 169 Δ > 0
22x2-9x-1=0
x = -b ∓ √Δ 2a
x' = 9 - √169 2*22 = 9 - 13.0 44 = -4.0 44 = -0.0909090909091
x" = 9 + √169 2*22 = 9 + 13.0 44 = 22.0 44 = 0.5
x' = -44.0
x" = 242.0
S = {x ∈ R / x' = -44.0, x" = 242.0 }