22x2 +18x -4 = 0
ax2 bx c = 0
a = 22
b = 18
c = -4
Δ = b2-4ac
Δ = 18² - (4 * 22 * -4)
Δ = 324 - (4*-88)
Δ = 324 - (-352)
Δ = 676 Δ > 0
22x2+18x-4=0
x = -b ∓ √Δ 2a
x' = -18 - √676 2*22 = -18 - 26.0 44 = -44.0 44 = -1.0
x" = -18 + √676 2*22 = -18 + 26.0 44 = 8.0 44 = 0.181818181818
x' = -484.0
x" = 88.0
S = {x ∈ R / x' = -484.0, x" = 88.0 }