22x2 +21x +5 = 0
ax2 bx c = 0
a = 22
b = 21
c = 5
Δ = b2-4ac
Δ = 21² - (4 * 22 * 5)
Δ = 441 - (4*110)
Δ = 441 - (440)
Δ = 1 Δ > 0
22x2+21x+5=0
x = -b ∓ √Δ 2a
x' = -21 - √1 2*22 = -21 - 1.0 44 = -22.0 44 = -0.5
x" = -21 + √1 2*22 = -21 + 1.0 44 = -20.0 44 = -0.454545454545
x' = -242.0
x" = -220.0
S = {x ∈ R / x' = -242.0, x" = -220.0 }