22x2 -2x -20 = 0
ax2 bx c = 0
a = 22
b = -2
c = -20
Δ = b2-4ac
Δ = -2² - (4 * 22 * -20)
Δ = 4 - (4*-440)
Δ = 4 - (-1760)
Δ = 1764 Δ > 0
22x2-2x-20=0
x = -b ∓ √Δ 2a
x' = 2 - √1764 2*22 = 2 - 42.0 44 = -40.0 44 = -0.909090909091
x" = 2 + √1764 2*22 = 2 + 42.0 44 = 44.0 44 = 1.0
x' = -440.0
x" = 484.0
S = {x ∈ R / x' = -440.0, x" = 484.0 }