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 = -44.0 44 = -1.0
x" = -2 + √1764 2*22 = -2 + 42.0 44 = 40.0 44 = 0.909090909091
x' = -484.0
x" = 440.0
S = {x ∈ R / x' = -484.0, x" = 440.0 }