22x2 +21x -16 = 0
ax2 bx c = 0
a = 22
b = 21
c = -16
Δ = b2-4ac
Δ = 21² - (4 * 22 * -16)
Δ = 441 - (4*-352)
Δ = 441 - (-1408)
Δ = 1849 Δ > 0
22x2+21x-16=0
x = -b ∓ √Δ 2a
x' = -21 - √1849 2*22 = -21 - 43.0 44 = -64.0 44 = -1.45454545455
x" = -21 + √1849 2*22 = -21 + 43.0 44 = 22.0 44 = 0.5
x' = -704.0
x" = 242.0
S = {x ∈ R / x' = -704.0, x" = 242.0 }