22x2 -7x -2 = 0
ax2 bx c = 0
a = 22
b = -7
c = -2
Δ = b2-4ac
Δ = -7² - (4 * 22 * -2)
Δ = 49 - (4*-44)
Δ = 49 - (-176)
Δ = 225 Δ > 0
22x2-7x-2=0
x = -b ∓ √Δ 2a
x' = 7 - √225 2*22 = 7 - 15.0 44 = -8.0 44 = -0.181818181818
x" = 7 + √225 2*22 = 7 + 15.0 44 = 22.0 44 = 0.5
x' = -88.0
x" = 242.0
S = {x ∈ R / x' = -88.0, x" = 242.0 }