22x2 -7x -9 = 0
ax2 bx c = 0
a = 22
b = -7
c = -9
Δ = b2-4ac
Δ = -7² - (4 * 22 * -9)
Δ = 49 - (4*-198)
Δ = 49 - (-792)
Δ = 841 Δ > 0
22x2-7x-9=0
x = -b ∓ √Δ 2a
x' = 7 - √841 2*22 = 7 - 29.0 44 = -22.0 44 = -0.5
x" = 7 + √841 2*22 = 7 + 29.0 44 = 36.0 44 = 0.818181818182
x' = -242.0
x" = 396.0
S = {x ∈ R / x' = -242.0, x" = 396.0 }