22x2 -7x -15 = 0
ax2 bx c = 0
a = 22
b = -7
c = -15
Δ = b2-4ac
Δ = -7² - (4 * 22 * -15)
Δ = 49 - (4*-330)
Δ = 49 - (-1320)
Δ = 1369 Δ > 0
22x2-7x-15=0
x = -b ∓ √Δ 2a
x' = 7 - √1369 2*22 = 7 - 37.0 44 = -30.0 44 = -0.681818181818
x" = 7 + √1369 2*22 = 7 + 37.0 44 = 44.0 44 = 1.0
x' = -330.0
x" = 484.0
S = {x ∈ R / x' = -330.0, x" = 484.0 }