22x2 -18x -4 = 0
ax2 bx c = 0
a = 22
b = -18
c = -4
Δ = b2-4ac
Δ = -18² - (4 * 22 * -4)
Δ = 324 - (4*-88)
Δ = 324 - (-352)
Δ = 676 Δ > 0
22x2-18x-4=0
x = -b ∓ √Δ 2a
x' = 18 - √676 2*22 = 18 - 26.0 44 = -8.0 44 = -0.181818181818
x" = 18 + √676 2*22 = 18 + 26.0 44 = 44.0 44 = 1.0
x' = -88.0
x" = 484.0
S = {x ∈ R / x' = -88.0, x" = 484.0 }