22x2 -9x -10 = 0
ax2 bx c = 0
a = 22
b = -9
c = -10
Δ = b2-4ac
Δ = -9² - (4 * 22 * -10)
Δ = 81 - (4*-220)
Δ = 81 - (-880)
Δ = 961 Δ > 0
22x2-9x-10=0
x = -b ∓ √Δ 2a
x' = 9 - √961 2*22 = 9 - 31.0 44 = -22.0 44 = -0.5
x" = 9 + √961 2*22 = 9 + 31.0 44 = 40.0 44 = 0.909090909091
x' = -242.0
x" = 440.0
S = {x ∈ R / x' = -242.0, x" = 440.0 }