22x2 +19x -15 = 0
ax2 bx c = 0
a = 22
b = 19
c = -15
Δ = b2-4ac
Δ = 19² - (4 * 22 * -15)
Δ = 361 - (4*-330)
Δ = 361 - (-1320)
Δ = 1681 Δ > 0
22x2+19x-15=0
x = -b ∓ √Δ 2a
x' = -19 - √1681 2*22 = -19 - 41.0 44 = -60.0 44 = -1.36363636364
x" = -19 + √1681 2*22 = -19 + 41.0 44 = 22.0 44 = 0.5
x' = -660.0
x" = 242.0
S = {x ∈ R / x' = -660.0, x" = 242.0 }