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 = -22.0 44 = -0.5
x" = 19 + √1681 2*22 = 19 + 41.0 44 = 60.0 44 = 1.36363636364
x' = -242.0
x" = 660.0
S = {x ∈ R / x' = -242.0, x" = 660.0 }