22x2 -13x -9 = 0
ax2 bx c = 0
a = 22
b = -13
c = -9
Δ = b2-4ac
Δ = -13² - (4 * 22 * -9)
Δ = 169 - (4*-198)
Δ = 169 - (-792)
Δ = 961 Δ > 0
22x2-13x-9=0
x = -b ∓ √Δ 2a
x' = 13 - √961 2*22 = 13 - 31.0 44 = -18.0 44 = -0.409090909091
x" = 13 + √961 2*22 = 13 + 31.0 44 = 44.0 44 = 1.0
x' = -198.0
x" = 484.0
S = {x ∈ R / x' = -198.0, x" = 484.0 }