-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 = 529 Δ > 0
-12x2-17x+5=0
x = -b ∓ √Δ 2a
x' = 17 - √529 2*-12 = 17 - 23.0 -24 = -6.0 -24 = 0.25
x" = 17 + √529 2*-12 = 17 + 23.0 -24 = 40.0 -24 = -1.66666666667
x' = 36.0
x" = -240.0
S = {x ∈ R / x' = 36.0, x" = -240.0 }