-12x2 -17x -5 = 0
ax2 bx c = 0
a = -12
b = -17
c = -5
Δ = b2-4ac
Δ = -17² - (4 * -12 * -5)
Δ = 289 - (4*60)
Δ = 289 - (240)
Δ = 49 Δ > 0
-12x2-17x-5=0
x = -b ∓ √Δ 2a
x' = 17 - √49 2*-12 = 17 - 7.0 -24 = 10.0 -24 = -0.416666666667
x" = 17 + √49 2*-12 = 17 + 7.0 -24 = 24.0 -24 = -1.0
x' = -60.0
x" = -144.0
S = {x ∈ R / x' = -60.0, x" = -144.0 }